convert-repo: use .git/objects/ rather than .git/HEAD to detect git repos

add some tests for qpush/qpop error codes

Modify qpush/qpop idempotent operations to return success Modify qpush/qpop such that idempotent instances of the operations return success. That is, repeated qpush -a, qpop -a, qpush patch-name or qpop patch-name will return success. The end goal of each of these operations is to reach a particular state. Whether or not the patches were already applied does not affect that state or operation status. Likewise, be careful to retain the error status on a qpush/qpop without arguments when the end/beginning of the series has been reached.

mq: propagate the return error of pop

util_win32.py: fix user_rcpath Fixes issue504.

Combined the two os_rcpath methods into a single one near rcpath in mercurial/util.py The os_rcpath method delegates to system_rcpath and user_rcpath from the different platform implementations.

merge with crew-stable

hgweb: catch util.Abort raised by addchangegroup Right now, if a pretxnchangegroup hook fails, we send some HTML error message to the client and the transaction is not rolled back (issue499). Catching util.Abort allows us to send a decent message to the client and for some reason makes the rollback complete. This patch is not perfect since it doesn't fix the reason why the transaction wasn't rolled back (maybe some circular references?). Also, the transaction is aborted only after we've sent the response back to the client and the "transaction aborted" message ends up in the logs of the web server.

notify: don't try to fix addresses if notify.domain is not set

mail.py: don't try to use TLS if python doesn't have SSL support This should hide the traceback from issue501.