Merge remote branch 'ko/master' into jc/read-tree-cache-tree-fix

* ko/master: (2325 commits) Git 1.7.2-rc2 backmerge a few more fixes to 1.7.1.X series fix git branch -m in presence of cross devices t/t0006: specify timezone as EST5 not EST to comply with POSIX add missing && to submodule-merge testcase t/README: document more test helpers test-date: fix sscanf type conversion xdiff: optimise for no whitespace difference when ignoring whitespace. gitweb: Move evaluate_gitweb_config out of run_request parse_date: fix signedness in timezone calculation t0006: test timezone parsing rerere.txt: Document forget subcommand t/README: proposed rewording... t/README: Document the do's and don'ts of tests t/README: Add a section about skipping tests t/README: Document test_expect_code t/README: Document test_external* t/README: Document the prereq functions, and 3-arg test_* t/README: Typo: paralell -> parallel t/README: The trash is in 't/trash directory.$name' ... Conflicts: builtin-read-tree.c