mq: use atomictempfiles during patch refresh

mq: create patch header class to abstract header manipulation

mq: gracefully abort qpush/qgoto to guarded patch (issue1186)

More verbose logging when filemerge searches for merge-tool Previously it was very hard to find out what was going on when the expected merge tool wasn't used. This patch tries to improve that. hg merge -v now shows which tools were searched for but not found.

templater: return data in increasing chunk sizes Currently hgweb is not streaming its output -- it accumulates the entire response before sending it. This patch restores streaming behaviour. To avoid having to synchronously write many tiny fragments, this patch also adds buffering to the template generator. Local testing of a fetch of a 100,000 line file with wget produces a slight slowdown overall (up from 6.5 seconds to 7.2 seconds), but instead of waiting 6 seconds for headers to arrive, output begins immediately.

tests: fix tests broken by 03b60f2f90bf

hgweb (coal/paper): make file, diff and annotate easier to render This patch removes tables altogether for file and diff, and removes one column from annotate, making firefox's incremental renderer much faster for large files.

inotify: fix status . in repo.root

patch: isolate patchfile filesystem calls into methods This is a first step toward an svn-like patch driver and makes patchfile monkeypatching much easier. The latter is currently required to support in-memory patching until the code is refactored.

patch: pass an opener to patchfile

util_win32: implement posixfile_nt.readlines()

patch: remove useless unlink() call