Change version numbering scheme. From 3.9.3 we go to 3.9.1-patch3

(3.9.1 being the upstream version number).  That way we state more
clearly that we have no intention to really fork.

[[Imported from SVN: r8387]]

configure.ac

@@ -3,7 +3,7 @@
 
 AC_PREREQ(2.57)
 
-AC_INIT(ug, 3.9.3, UG-REPORT-ADDRESS)
+AC_INIT(ug, 3.9.1-patch3, UG-REPORT-ADDRESS)
 AM_INIT_AUTOMAKE
 
 AC_CONFIG_SRCDIR([initug.c])