changegroup: add source parameter to generatemanifests
Extensions, like remotefilelog, will want to look at the source of a pull when
determining what manifests to add to a changegroup. For instance, on push they
will include everything, while on pull they won't.
Differential Revision: https://phab.mercurial-scm.org/D686
Our full contribution guidelines are in our wiki, please see:
https://www.mercurial-scm.org/wiki/ContributingChanges
If you just want a checklist to follow, you can go straight to
https://www.mercurial-scm.org/wiki/ContributingChanges#Submission_checklist
If you can't run the entire testsuite for some reason (it can be
difficult on Windows), please at least run `contrib/check-code.py` on
any files you've modified and run `python contrib/check-commit` on any
commits you've made (for example, `python contrib/check-commit
273ce12ad8f1` will report some style violations on a very old commit).