Fix how setup.py identifies the Mercurial version.
There is a problem with setup.py where it will not identify the Mercurial
version properly when not being ran in within a repository even if
mercurial/__version__.py exists.
To fix, use mercurial.__version__.version when available before defaulting
to "unknown". (Using mercurial.util.version() is not an option due to a
dependency issue where osutil can be referenced before it is built.)
addremove/findrenames: find renames according to the match object (
issue1527)
Instead of only finding similarities in the added/removed files found
by the addremove step, follow the match object:
hg addremove -s80 foo -> add and removes files in foo
+ find similarities between files in foo
hg addremove -s80 -> add and removes files in the whole repo
+ find similarities between files in the whole repo
hg import --similarity will still work correctly (only find similarities
between files found in the patch).