message catalogs: fix comment lines, also remove linux hack in merge.c

According to the spec, blank lines in message catalogs or lines
beginning with '$ ' are valid comments.

However, there were many cases where lines in the message catalogs
contained just a single '$', without the required space after it.

Under linux, this caused 126766 error lines (in my builds) of the
form:

... unknown directive `': line ignored

This also causes gencat to exit with a non-0 exit code.  Even though
gencat says it ignores the line, it really doesn't.

An early porting change to programs/localized/util/merge.c was made to
ignore this return value on linux.  This hack has now been removed.

Build logs are a lot smaller and cleaner now.

cde/programs/dtpad/dtpad.msg

@@ -190,20 +190,20 @@ $ label specified in message 110 of set 11.
 $ Labels for add/don't-add newlines radio buttons in the SaveAs and Save dialogs
 44 Add newline characters to the end of wrap-to-fit lines.
 45 Do not add newlines.  Only line breaks created by [Return]\nwill be preserved.
-$
+$ 
 $ New message as of 5/31/95 (i.e. new since Sample Implementation). This 
 $ new message is in response to bug DTS CISlx19530.
-$
+$ 
 46 Either file is unwritable or path to\nfile does not exist.
 
-$
+$ 
 $ "-NEW"
-$
+$ 
 47 "Operation failed due to insufficient memory.\nTry increasing swap space."
 
-$
+$ 
 $ "-NEW"
-$
+$ 
 48 "Format operation failed."
 
 $set 6
@@ -262,7 +262,7 @@ $ This should correspond to the default file name used in the "Save As"
 $ dialog box - specified in message 21 of set 5.
 6 (UNTITLED)
 
-$
+$ 
 $ New messages (7,8) since CDE/SI - error gets displayed when user tries to run
 $ dtpad -server when and dtpad server process is already running on the
 $ $DISPLAY.
@@ -270,11 +270,11 @@ $ $DISPLAY.
 is already serving this display.
 8 ERROR: A dtpad server is already\n\
 serving this display.
-$
+$ 
 $ Message 9 is also new since CDE/SI - new as of 5/22/95.  It is a usage message
 $ for dtpad. Don't translate the '-OPTION' just the text explaining the
 $ option.
-$
+$ 
 9 '%s' is a bad option.\n\
 Usage: %s...\n\
    -saveOnClose\n\
@@ -335,7 +335,7 @@ $ "NEW-"
 13 "Could not connect to ToolTalk service:\n%s\n%s\n"
 
 
-$
+$ 
 $set 10
 $ ************************************************************************
 $ **                                                          session.c **
@@ -644,18 +644,18 @@ $ **
 $ ****************************************************************************
 $ ****************************************************************************
 $set 14
-$
+$ 
 $	Messages 1 - 17 are used in printJob.
-$
+$ 
 $	This is warning message is displayed when the user has provided
 $	a margin specifier in the PrintSetup dialog which cannot be parsed.
 $	
 $quote "
 1 "One of the following margin specifiers \n has incorrect syntax: \n %s \n %s \n %s \n %s \nUse default margins instead?"
-$
+$ 
 $	Messages 2 - 7 are messages for errors which can occur in the
 $	process of loading a dtpad document file for printing.	
-$
+$ 
 2 "File does not exist."
 3 "Specified file is a directory."
 4 "File type error."
@@ -665,7 +665,7 @@ $
 
 $	Messages 8 - 11 are format strings used to construct the header
 $	and footer strings which appear in the printing output.
-$
+$ 
 $	Message 8 is the format string used to make a Date header/footer.
 $	Message 9 is the format string used to make a DocName header/footer.
 $	Message 10 is the format string used to make a Page# header/footer.
@@ -675,11 +675,11 @@ $	Message 11 is the format string used to make a UserName header/footer.
 10 "Page %d of %d"
 11 "Document For:  %s"
 
-$
+$ 
 $	Messages 12 - 13 are used in printSetup to construct the
 $	app-specific printing options for DtMail which will be included
 $	in the DtPrintSetupBox.
-$
+$ 
 $	Message 12 is the string labeling the field in the GUI which
 $	contains the name of the document.
 $	Message 13 is the label used on the Toggle Button to indicate that
@@ -690,7 +690,7 @@ $	"wrapped" to the next line.
 
 
 $	Messages 14 - 15 are status messages for the PrintToFile function.
-$
+$ 
 $	Message 14 indicates that the PrintToFile function was unsuccessful.
 $	Message 15 indicates that the PrintToFile function was successful.
 $	NOTE: 'Print to File' should be translated as in 
@@ -699,9 +699,9 @@ $	      DtPrint.msg:Set1, Msg3.
 15 "'Print to File' completed successfully."
 
 $          Messages 16 - 19 are obsolete, and have been replaced by 25
-$
+$ 
 $	Messages 16 - 19 are status messages for the popup PDM function.
-$
+$ 
 $	Message 16 indicates that there was no pdm deamon running.
 $	Message 17 indicates that the pdm deamon was unable to start a pdm.
 $	Message 18 indicates that the pdm couldnt connect to the video display.
@@ -712,7 +712,7 @@ $	Message 19 indicates that the pdm couldnt connect to the print display.
 19 "PDM is not authorized to connect to Print display."
 
 $	Messages 20 - 22 are status messages displayed while printing
-$
+$ 
 $	Message 20 indicates that the user has asked to close the editor
 $		   window.  Dtpad is prevented from doing so until the
 $		   active print jobs have completed.
@@ -742,12 +742,12 @@ $ **	SET 15
 $ **
 $ ****************************************************************************
 $ ****************************************************************************
-$
+$ 
 $set 15
-$
+$ 
 $	Messages 1-5 are used in printSetup.c in the pulldown menu for the
 $	header/footer options in the print setup dialog.
-$
+$ 
 $	Message 1 specifies that the page header/footer field be empty.
 $	Message 2 put the Date in the page header/footer field.
 $	Message 3 put the Document Name in the page header/footer field.
@@ -761,7 +761,7 @@ $	Message 5 put the User Name msg header in the page header/footer field.
 
 $	Messages 6-9 are used to construct error messages informing users
 $	that they have input an invalid print page margin specification for 
-$
+$ 
 6 "Top Margin specifier is invalid:  "
 7 "Right Margin specifier is invalid:  "
 8 "Bottom Margin specifier is invalid:  "