cmdutil: remove forwarding methods per deprecation policy

util: always force line buffered stdout when stdout is a tty (BC) pager replaced stdout with a line buffered version to work around glibc deciding on a buffering strategy on the first write to stdout. This is going to make my next patch hard, as replacing stdout will make tracking time spent blocked on it more challenging. Move the line buffering requirement to util.py, and remove it from pager. This means that the abuse of ui.formatted=True and pager set to cat or equivalent no longer results in a line-buffered output to a pipe, hence (BC), although I don't expect anyone to be affected

localrepo: avoid unnecessary conversion from node to rev changelog.heads() first calls headrevs then converts them to nodes. localrepo.heads() then sorts them using self.changelog.rev function and makes useless conversion back to revs. Instead let's call changelog.headrevs() from localrepo.heads(), sort the output and then convert to nodes. Because headrevs does not support start parameter this optimization only works if start is None.

debian: update copyright years

debian: update mailing list address

bundle2: implement a basic __repr__ for bundle2 part We display basic data as the part id and part type. This make debugging bundle2 related code friendlier.

bundle2: drop an outdated comment The function is no longer in "early" stage and have been used in production for years. We can probably drop that part of the docstring...

unbundle: swap conditional branches for clarity This is a small style update for clarity. The previous situation was: if foo: 50 lines else: 2 lines In such case I tend to invert these to get the simpler branch out of the way earlier: if not foo: 2 lines else: 50 lines This makes the conditional and various alternatives fit on the same screen, simpler to read overall.

unbundle: add a small comment to tag the bundle1 case as such This makes the code clearer to understand for someone new to it (or rusted)

unbundle: add a small comment to clarify the 'check_heads' call Bundle2 has its own mechanisms to check for heads (and other) changes, so push using bundle2 is relying on the "check:heads" bundle part of unbundle and the 'check_heads' call is not checking anything. We add a small comment to make this clearer.