extdiff: preserve execute-bit across copies (issue1562) Bug report and test by Mads Kiilerich <mads@kiilerich.com>

extdiff: merge node and working dir snapshot modes

convert/p4: win32 fixes * cmd.exe does not know single quotes * win32 does not like trailing whitespace very much. Trade test coverage for maintenance time and drop the trailing whitespaces tests.

test-issue1438: make executable

context: fix workingctx.__contains__

run-tests: detect when hghave fails to check for a feature and fail test hghave exitcode != 0 might mean that hghave failed to check for feature avaibility. Detect those cases, and fail the test, instead of skipping it.

hghave: checking that all targets are Exception-free

Add Python 2.6 support to win32 installer With Python 2.6, win32 installer should try to package MSVC9.0 dlls instead of MSVC7.1 dlls

Bundle python dll in win32 installer if present in case hg.exe is generated with the py2exe '-b 2' option instead of '-b 1', python2?.dll is not included in library.zip file and must also be packaged. The file will be integrated in the installer only if it is present in the dist directory. Generating hg.exe with the '-b 2' option is mandatory to avoid a crash when pyreadline is installed.

Win32 installer: add hgrc.5.html and hgignore.5.html links to Start Menu folder