namespaces: fix name/node confusion There was a lot of copy/paste here.

tests: add test for "log -r wdir() -p" (issue4871) The issue has been fixed by 93bcc73df8d5, "cmdutil.changeset_printer: pass context into showpatch()". This patch adds test to prevent future regression.

tests: include modified/added/removed files in "log -r wdir()" output This patch prepares for the test of "hg log -r wdir() -p".

contrib: revsetbenchmarks use absolute_import and print_function

contrib: synthrepo use absolute_import

contrib: python-hook-examples use absolute_import

contrib: make perf.py use absolute_import

largefiles: replace invocation of os.path module by vfs in lfutil.py Replaces invocations os.path functions to methods in vfs. Unfortunately (in my view) this makes code less readable, because instead of using clear variable names with path it needs to replace them with vfs(..). I need guidance how to make such transition look more readable. For example in this patch there is example with few places with wvfs.join(standindir), standindir before this patch was absolute path, in this it is changed to relative because it is used also in expression wvfs.join(standindir, pat).

largefiles: replace invocation of os.path module by vfs in lfcommands.py

cache: rebuild branch cache from scratch when inconsistencies are detected This should recover automatically from some corruptions that for unknown reasons are seen in the wild.