Improve existing git helper scripts

buildroot/share/git/mfnew

@@ -2,20 +2,15 @@
 #
 # mfnew
 #
-# Create a new branch based on RCBugFix or dev a given branch name
+# Create a new branch from the default target with the given name
 #
 
 MFINFO=$(mfinfo) || exit
 IFS=' ' read -a INFO <<< "$MFINFO"
 TARG=${INFO[3]}
 
-if [[ ${INFO[4]} == "(no" ]]; then
-  echo "Branch is unavailable!"
-  exit 1
-fi
-
 case "$#" in
-  0 ) BRANCH=pr_for_$TARG-$(date +"%G-%d-%m|%H:%M:%S") ;;
+  0 ) BRANCH=pr_for_$TARG-$(date +"%G-%m-%d_%H.%M.%S") ;;
   1 ) BRANCH=$1 ;;
   * ) echo "Usage: `basename $0` [branch]" 1>&2 ; exit 1 ;;
 esac