convert: handle exec bit removal while converting to svn Subversion `putcommit` method checks original file's executablity to decide if executable property should be removed from svn. It is checked right after writing file contents. Content writing is implemented using `vfs.write` and vfs seems to remove exec bit, at least in some cases. This leads to executability checks being ineffective. If cset contains only this ignored exec bit removal, conversion stops with an error, because it fails to to compose svn commit properly. This fix moves exec bit checking so that it's performed before dumping file contents. Added test to check executable bit removal.

convert: handle empty intial commits while converting to svn Svn commit generation code skips empty commits, returning the parent. Skipping the root commit must return None instead. Added test to check skipping of empty commits.

branchmap: encapsulate cache updating in the map itself Rather than have a repository update the cache, move handling of cache updates into the branchmap module, in the form of a custom mapping class. This makes later performance improvements easier to handle too. Differential Revision: https://phab.mercurial-scm.org/D5638

tests: fix regression tests failing on CentOS 7 Differential Revision: https://phab.mercurial-scm.org/D5877

packaging: modify rc detection to work with X.Yrc instead of X.Y-rc rc detection on CentOS failed without this change, resulting in upgrades from 4.9rc to 4.9 not working (4.9rc was considered more recent than 4.9). Differential Revision: https://phab.mercurial-scm.org/D5876

context: replace repeated "self._repo.dirstate" by "ds" variable Differential Revision: https://phab.mercurial-scm.org/D5889

context: delete unused undelete() Maybe it's been unused since c8e2a5ea7062 (mq: avoid data loss upon qfold + qmv (issue3058), 2011-10-20), maybe not. Differential Revision: https://phab.mercurial-scm.org/D5888

diffordiffstat: avoid looking up contexts twice I'm not worried about performance; this is just simpler. Differential Revision: https://phab.mercurial-scm.org/D5890

fsmonitor: rename new verbose config knob The config knob was introduced in this release cycle under the old extension name, rename it before it is part of a release. Differential Revision: https://phab.mercurial-scm.org/D5880

tests: stabilize test-extdiff.t on Windows The test harness only wanted to drop the (windows !) lines, which also means the actual output matched the (no-windows !) lines. So drop those annotations too. I suspect if the output of the affected tests was actually collected on Windows, things were quoted because TEMPDIR contained a `~` in MSYS. Typically that happens when the username is 9 (8?) or more characters. I explicitly set TEMP and TMP to something short like "C:\temp" to avoid this, because otherwise there are a bunch of failures like this in other tests.