autom4te-cache-is-evil-20060903

Purge autom4te.cache after running autoconf so that we don't ship its huge
trace files in source releases.  Add #!/bin/sh to the beginning of regen.sh
just because.

regen.sh

@@ -1,3 +1,4 @@
+#!/bin/sh
 echo "Updating configuration..."
 echo "Running aclocal"
 aclocal -I src/cf
@@ -11,6 +12,9 @@ autoheader
 #echo "Running automake"
 #automake
 
+echo "Deleting autom4te.cache directory"
+rm -r autom4te.cache
+
 # Rebuild the man pages, to not require those building from source to have
 # pod2man available.
 if test -d doc/man-pages ; then