gitcam: add new command for git --amend -a commit

bin/gitcam

+#!/bin/sh
+# Do commit amend for all files
+
+# load common functions, compatible with local and installed script
+. `dirname $0`/../share/eterbuild/functions/common
+
+if [ "$1" = "-h" ] || [ "$1" = "--help" ]; then
+	echo "gitcam - do fast git commit amend (apply all current changes to the last commit)"
+	echo "Use: gitcam [-e]"
+	echo "     -e - edit commit message"
+	exit 1
+fi
+
+if [ "$1" = "-e" ] ; then
+	docmd git commit -a --amend $@
+else
+	docmd git commit -a --amend -C HEAD $@
+fi