fix #19687 : moving bracket causes crash
Merge pull request #170 from Soerboe/fix19687

fix #19687 : moving bracket causes crash
Improve post-checkout hook and README

Make the post-checkout hook only update revision.h on branch-level
checkout. Add "assume unchanged" status to revision.h.
Expanded the description in README.
Merge pull request #193 from softins/checkout-hook

Improve post-checkout hook and README