-Introduce new Requester_window to ask the user to enter a single value

-Reduce colors in the palette screen is now a dropdown for easy access to usual values. "Other" option opens a requester to enter a custom one if needed
-Some cleanup to make things a little more readable
-Build fixes after versionning system revert


git-svn-id: svn://pulkomandy.tk/GrafX2/trunk@1090 416bcca6-2ee7-4201-b75f-2eb2f807beb1

help.c

@@ -46,6 +46,9 @@
 #include "hotkeys.h"
 #include "errors.h"
 
+extern char Program_version[]; // generated in pversion.c
+extern char SVN_revision[]; // generated in pversion.c
+
 // Recherche un raccourci clavier:
 word * Shortcut(word shortcut_number)
 {