pull -r: pass the revisions as the heads argument of findincoming This can make a hg pull -r faster if the remote repo has many heads, and fixes an "abort: received changelog group is empty".

convert: fix /dev/null redirections under Windows

Test git repository conversion

hghave: detect git availability

convert: fix issue702 about GIT_DIR= construct unsupported under Windows.

convert: gitcmd wrapper for os.popen

fix test-permissions output

testcase for issue705 (fixed by 316ce5e85b3e)

merge with -stable

check exec: return fallback in case of error during the check If there is any error while checking if exec is supported, we can return fallback. fix issue705