Enhance Makefile generated ChangeLog entries

Convert git log entries, which are prepended to the ChangeLog, to
look more like traditional ChangeLog entries.

Makefile.am

@@ -33,7 +33,14 @@ dist-hook:
 		echo Creating ChangeLog && \
 		( cd "$(top_srcdir)" && \
 		  echo '# Generated by Makefile. Do not edit.'; echo; \
-		  $(top_srcdir)/missing --run git log --stat GPARTED_0_4_4.. \
+		  $(top_srcdir)/missing --run \
+		  git log GPARTED_0_4_4.. --date-order --date=short | \
+		  sed -e '/^commit.*$$/d' | \
+		  awk '/^Author/ {sub(/\\$$/,""); getline t; print $$0 t; next}; 1' | \
+		  sed -e 's/^Author: //g' | \
+		  sed -e 's/>Date:   \([0-9]*-[0-9]*-[0-9]*\)/>\t\1/g' | \
+		  sed -e 's/^\([^\t<]*[<][^\t>]*>\)\t\([^\t]*\)/\2  \1/g'; \
+		  echo; \
 		) > ChangeLog.tmp \
 		&& cat $(top_srcdir)/ChangeLog >> ChangeLog.tmp \
 		&& mv -f ChangeLog.tmp $(top_distdir)/ChangeLog \