Create a new subdirectory for the common dialog box DLL and move all
code from /misc/commdlg.c to this directory.  Also made a start in
documenting the API calls.

diff --git a/configure b/configure
index a228f44..799cea6 100755
--- a/configure
+++ b/configure
@@ -4598,6 +4598,7 @@
 dlls/Makefile
 dlls/advapi32/Makefile
 dlls/comctl32/Makefile
+dlls/commdlg/Makefile
 dlls/imagehlp/Makefile
 dlls/msacm/Makefile
 dlls/msacm32/Makefile
@@ -4758,6 +4759,7 @@
 dlls/Makefile
 dlls/advapi32/Makefile
 dlls/comctl32/Makefile
+dlls/commdlg/Makefile
 dlls/imagehlp/Makefile
 dlls/msacm/Makefile
 dlls/msacm32/Makefile