convert: rename mapfile to revmapfile, so we can map more than just revs

convert svn: try to extract URL from source if it is a working directory

Merge with mpm

convert: urlify svn repos if necessary. We should also try to extract the URL from an svn working directory.

revlog: localize some fastpath functions

revlog: minor chunk speed-up

revlog: minor revdiff reorganization

revlog: move flag checking out of the offset fastpath

dirstate: localize a bunch of methods in status fastpath

dirstate: speed up sorting in findfiles

revlog: pass mode to _supported directly

dirstate: localize a bunch of methods for findfiles

Merge with -stable

posixfile_nt: '+' should allow read access. This fixes unexpected I/O error on committing many files due to cset:8a53b39cd402 (r4902 in crew).

merge: don't forget to update the dirstate for exec bit changes

revlog: avoid some unnecessary seek/tell syscalls

manifest: speed up creation of the manifestdict - fold iteration and rawset into parse - avoid creating extra new strings with [:] where possible - speed up node.bin

lazyparser.findnode: fix typo and s/rfind/find/ There's no reason to use reverse string search and it's slightly slower

lazyindex: speed up __getitem__ This function is fairly performance sensitive, so we make a couple ugly tweaks: - keep all entries packed so we needn't test entry types - fold index lookup/load into unpack call to eliminate local variable setting

lazyparser: up the blocksize from 512 bytes to 64k

revlog: implement a fast path for heads

revlogio: speed up parsing - precalcuate ending offset - pull some variables into local scope - separate inline and out of line code paths

revlog: eliminate diff and patches functions call mdiff variants directly

revlog: speed up chunkcache - use a reasonable cache size - avoid an extra copy when we pull in big revs