dtwm: basic multihead(xinerama only) support

* maximization (also partially fixes strange Firefox behaviour)
* sane initial window placement

Firefox is stranger than most; it appears to maximize to double
X Screen width even on single head displays.  Fixed (on multihead).

cde/programs/dtwm/Imakefile

@@ -15,8 +15,8 @@ DEPEND_DEFINES = $(DEPENDDEFINES)
 DEFINES = $(MWMDEFINES) $(DTWMDEFINES) -DMULTIBYTE -DMINIMAL_DT
 
 DEPLIBS = DepDtClientLibs
-LOCAL_LIBRARIES = DtClientLibs
-SYS_LIBRARIES = DtClientSysLibs DtClientExtraLibs
+LOCAL_LIBRARIES = DtClientLibs -lDtXinerama
+SYS_LIBRARIES = DtClientSysLibs DtClientExtraLibs -lXinerama
 
 #if defined(HPArchitecture)
 EXTRA_DEFINES = -D_HPUX_SOURCE 
@@ -32,7 +32,8 @@ SRCSXM = \
         WmMenu.c        WmProperty.c    WmProtocol.c \
         WmResCvt.c      WmResParse.c    WmResource.c \
         WmSignal.c      WmWinConf.c     WmWinInfo.c \
-        WmWinList.c     WmWinState.c    version.c
+        WmWinList.c     WmWinState.c    version.c \
+        WmMultihead.c
 
 SRCSDT = \
         Button.c        Callback.c      Clock.c \
@@ -53,7 +54,8 @@ OBJSXM = \
         WmMenu.o        WmProperty.o    WmProtocol.o \
         WmResCvt.o      WmResParse.o    WmResource.o \
         WmSignal.o      WmWinConf.o     WmWinInfo.o \
-        WmWinList.o     WmWinState.o    version.o
+        WmWinList.o     WmWinState.o    version.o \
+        WmMultiHead.o
 
 OBJSDT = \
         Button.o        Callback.o      Clock.o \