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/localized/es_ES.ISO8859-1/msg/dtpad.msg

@@ -210,17 +210,17 @@ $ Labels for add/don't-add newlines radio buttons in the SaveAs and Save dialogs
 creadas por [Intro]."
 $ New message as of 5/31/95 (i.e. new since Sample Implementation). This 
 $ new message is in response to bug DTS CISlx19530.
-$
+$ 
 46 "O bien no se puede escribir en el archivo o bien\nla ruta al archivo no existe. "
 
-$
+$ 
 $ "-NEW"
-$
+$ 
 47 "Operation failed due to insufficient memory.\nTry increasing swap space."
 
-$
+$ 
 $ "-NEW"
-$
+$ 
 48 "Format operation failed."
 
 $set 6        Redefine set#
@@ -306,11 +306,11 @@ ya est
 
 8 ERROR: Un servidor dtpad ya está\n\
 sirviendo esta pantalla.
-$
+$ 
 $ 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' es una opción incorrecta.\n\
 Uso: %s...\n\
@@ -363,7 +363,7 @@ Uso: %s...\n\
 \tse debe utilizar con la opción -server ya que\n\
 \tsolamente corresponde al proceso del servidor.\n\n\
 Vea la página manual dtpad para obtener información detallada adicional acerca de las funciones mencionadas anteriormente.\n\n
-$
+$ 
 
 $ "NEW-"
 11 "Exiting text editor ..."
@@ -726,17 +726,17 @@ $ **
 $ ****************************************************************************
 $ ****************************************************************************
 $set 14
-$
+$ 
 $	Messages 1 - 11 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.
 $	
 1 "La sintaxis de uno de los siguientes especificadores de margen \nes incorrecta: \n %s \n %s \n %s \n %s \n¿Desea utilizar márgenes predeterminados?"
-$
+$ 
 $	Messages 2 - 7 are messages for errors which can occur in the
 $	process of loading a dtpad document file for printing.	
-$
+$ 
 2 "El archivo no existe."
 3 "El archivo especificado es un directorio."
 4 "Error de tipo de archivo."
@@ -746,7 +746,7 @@ $
 
 $	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.
@@ -756,11 +756,11 @@ $	Message 11 is the format string used to make a UserName header/footer.
 10 "Página %d de %d"
 11 "Documento para:  %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
@@ -771,7 +771,7 @@ $	"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 DtPrint.msg
@@ -780,9 +780,9 @@ $               Set 1, Message 3.
 15 "'Imprimir en archivo' se ha realizado correctamente."
 
 $          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.
@@ -793,7 +793,7 @@ $	Message 19 indicates that the pdm couldnt connect to the print display.
 19 "PDM no está autorizado para conectarse con la pantalla de impresión."
 
 $	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.
@@ -822,12 +822,12 @@ $ **	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.
@@ -841,7 +841,7 @@ $	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 "El especificador del margen superior no es válido:  "
 7 "El especificador del margen derecho no es válido:  "
 8 "El especificador del margen inferior no es válido:  "