Last minute change broke loose object creation on AIX.

(performance fix) We used to make $GIT_DIR absolute path early in the programs but keeping it relative to the current directory internally gives 1-3 per-cent performance boost.

bash completion knows the new --graph option to git-log family.

git-diff -c/--cc showed unnecessary "deletion" lines at the context boundary.

git-for-each-ref ignored %(object) and %(type) requests for tag objects.

git-merge usage had a typo.

Rebuilding of git-svn metainfo database did not take rewriteRoot option into account.

Running "git-rebase --continue/--skip/--abort" before starting a rebase gave nonsense error messages.