[PATCH 0 of 1] [PATCH] acl: more descriptive error messages

[elifarley at gmail.com]

acl: more descriptive error messages

It's easier to identify the reason a commit or push failed if the error message tells us, in addition to the problematic changeset:

- whether it was a branch access restriction or a path access restriction
- whhether the changeset failed due to restrictions on the 'allow' list or the 'deny' list
- the path that was rejected, for path access restrictions

This patch hopefully improves the error messages so that they meet these criteria.