Faciliate the use of ctags and add gajim.desktop dep

Makefile

@@ -113,7 +113,7 @@ install:
 		chmod +x "$(DESTDIR)$(PREFIX)/bin/$$BASE"; \
 	done
 
-gajim.desktop:
+gajim.desktop: gajim.desktop.in
 	intltool-merge -d po gajim.desktop.in gajim.desktop
 
 #
@@ -131,6 +131,7 @@ help:
 	@echo make idle		- makes only idle detection module
 	@echo make translation	- makes only translation \(mo files\)
 	@echo make gtkspell	- makes only gtkspell detection module
+	@echo make tags		- makes 'tags' file for use with ctags
 	@echo
 
 #
@@ -148,3 +149,10 @@ uninstall:
 	rm -f	"$(DESTDIR)$(PREFIX)/share/applications/gajim.desktop" #the desktop
 	find "$(DESTDIR)$(PREFIX)/share/locale" -name 'gajim.mo' -exec rm {} \; #the .mo files
 	@echo done uninstalling
+
+tags:
+	-rm tags
+	exuberant-ctags -R
+
+.PHONY: all translation trayicon gtkspell idle clean dist install help\
+	uninstall tags