Update to 1.6.3

This is a monthly bugfix release. It includes several significant fixes,
including a fix for a long-standing hardlink corruption issue on Windows.

alias:	make shadowing behavior more consistent (issue2054)
bisect:	better message for unrelated starting revisions
bookmarks:	Check if the bookmark to delete exists on the remote
bookmarks:	guard against listing bookmarks on unsupported repos
chunkbuffer:	use += rather than cStringIO to reduce memory footprint
convert:	Using --dest-type svn crashed, if the source repo used tags.
convert:	properly set encoding for gnuarch converter
convert:	use encoding.encoding instead of locale.getpreferredencoding()
encoding:	improve handling of buggy getpreferredencoding() on Mac OS X
graphlog:	mark --branch as incompatible with --graph
http basic auth:	reset redirect counter on new requests (issue2255)
httprepo:	decompress stream incrementally to reduce memory usage
log:	fix the bug 'hg log --stat -p == hg log --stat'
mercurial.spec:	gettext is a build requirement for getting proper
localization
merge:	drop reference to file contents after write
merge:	move reverse-merge logic out of filemerge (issue2342)
merge:	fix detection of conflict markers with checkconflicts enabled
mq:	don't inherit default and default-push paths with --mq (issue2333)
resolve:	updated help documentation for improved clarity
revlog:	drop cache after use to save memory footprint
templatefilters:	unnest uescape()
templates:	add filenolink to raw style (issue2332)
url:	expand vars in all [auth] settings (issue2328)
url:	limit expansion to safe auth keys (Issue2328)
util:	avoid using hashlib on Python < 2.5 (issue2278)
verify:	initialize rp variable in case we hit out of memory
verify:	reduce memory footprint when unpacking files
verify:	report exceptions that don't have a str() method
win32:	correctly break hardlinks on network drives (issue761)

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