byterange: backport fix from upstream

hgweb: send proper error messages to the client Fixes a bug in protocol which caused an exception during exception handling in some cases on Windows. Also makes sure the server error message is correctly propagated to the client, instead of being thrown away.

transaction: always remove empty journal on abort When transactions without entries were aborted, the journal (of size 0) was not unlinked, which prevents subsequent operations until hg recover is run on the repository. We also make sure the journal is unlinked when committing, even if the provided hook doesn't do so.

test-bisect: fix shell-dependent output

change 'journal already exists' to 'abandoned transaction found' Journal already exists is a pretty internal piece of information, which doesn't necessarily mean much to people who are not familiar with the code. The new text is a more well-known concept.

verify: report existence of journal

bisect: no need to save the state if it wasn't changed

record: get the right position (account for skipped files)

log --limit: break after a limited number of csets (broken by f3d60543924f)

transaction: more specific exceptions, os.unlink can raise OSError