patch: fix git sendmail handling without proper mail headers

hgk: allow any extdiff command for visual diff

osutil.c: style fix - delete trailing end-of-line spaces

convert: do not output when trying to load svn bindings

convert: split converters into sink/source

Test darcs converter

convert: fix darcs_source.pull() under windows

convert: fix darcs_source._run() under windows

hghave: detect darcs client

hghave: reorder check functions and entries

Test workingctx exec/link bit for copies. Also, make the test runnable on platforms without symlinks.

Fix workingctx exec/link bit of copies on non-supporting systems

test-manifest: test symlink and exec bit display

Display symlink or executable bit with manifest -v New output looks like: 644 a 755 * b/a 644 @ l

convert: quote "^" to avoid windows using it as an escape char.

Always copy the necessary files before applying a git patch This patch removes the "copymod" attribute from the gitpatch class. AFAICS, that attribute was only used to delay the copying of renamed/copied files if there are no other changes to the target, but in this case, if there are changes to the source, we'll end up copying the wrong version. This should fix issue762.