copy: if destination ends with "/", make sure it's a directory Fixes issue724.

manifest: minor performance tweak

dirstate: speed up read and write read: - single call to len(st) - fewer assignments for position tracking - don't split apart tuple from unpack - use a literal for the unpack spec write: - localize variables and functions - avoid copied function call - use % for string concatenation

dirstate: make dir collision logic faster - shortcircuit decpath if we haven't built the _dirs map - increment only for leafnodes of directory tree (this should make construction more like O(nlog n) than O(n^2))

Merge with crew

revlog: fix inlined revision transaction extra data (issue 749)

Merge with crew-stable

bisect: remove useless try/except

Merge with crew-stable

bisect: don't write data on failure

bisect: do silent init if necessary

Test renaming files brought by merge second parent (issue 746)