doc: reword "config file" to "configuration file" While we do use the abbreviation "config" elsewhere in the docs, the phrase "configuration file" is always written out in full, except in this location in phases.txt.

run-tests: make --noskips work

filelog: switch 'not len(filerevlog)' to 'not filerevlog' A few places in the code use 'if not len(revlog)' to check if the revlog exists. Replacing this with 'not filerevlog' allows alternative revlog implementations to override __nonzero__ to handle this case without implementing __len__.

annotate: simplify annotate parent function The annotate algorithm used a custom parents() function to try to reuse filectx and filelogs. I simplified it a bit to rely more heavily on the self.parents() which makes it work well with alternative filectx implementations. I tested performance on a file with 5000+ revisions but no renames, and on a file with 500 revisions repeating a series of 4 edits+renames and saw zero performance hit. In fact, it was reliably a couple milliseconds faster now. Added the perfannotate command to contrib/perf.py for future use.