rpms: add hgdemandimport in files

rpms: remove '%if "%{?pythonver}" != "2.4"' Mercurial requires python >= 2.7.

obsstore: do not load all markers to detect duplication This will make duplication detection something like O(newmarkers) instead of O(obsstore).

clonebundles: reference correct config option This option is no longer experimental.

filestat: move __init__ to frompath constructor We're going to add a `fromfp` constructor soon, and this also allows a filestat object for a non-existent file to be created.

test-dirstate-race: ensure that a isn't in the lookup set at the end We're going to rely on this in upcoming patches.

hghave: add test for whether fsmonitor is enabled This uses the HGFSMONITOR_TESTS environment variable that fsmonitor-run-tests.py adds.

tests: add a wrapper to run fsmonitor tests This script does a bunch of non-trivial configuration work: in particular, it sets up an isolated instance of Watchman which isn't affected by global state and can be torn down on completion. This script also sets the HGFSMONITOR_TESTS environment variable, which hghave will use in the next patch to allow gating on whether fsmonitor is enabled. With fsmonitor enabled, there appear to be a number of failures in the test suite. It's not yet clear to me why they're happening, but if someone would like to jump in and fix some of them I hope this will be helpful for that.

setdiscovery: improves logged message The 'srvheads' list contains all server heads including the common ones. We adjust 'ui.log' message to provide more useful information about server heads locally unknown. The performance impact of turning the list to set is negligible (about 1e-4s) compared to the rest of the discovery cost, so I'm taking the easy path.

tests: handle variation between pure and normal output in annotate --skip I'm pretty sure that both results are valid, depending on how you slice the edits.