graph: optimize rendering by appending all nodes at once

Fix gitweb to not say shortlog instead of graph.

tighter default argument selection in localrepo.branchheads()

merge from crew-stable

use ${PYTHON} var in doc/Makefile as well

merge: only in-branch merges can be implicit

get repo.branchheads() to use working directory's branch by default

kill some trailing spaces

graph: display branch name alongside tags

test-commit: test unset date is not read as epoch origin

Fix commit date (issue1193) The None check in workingctx prevents calling util.makedate when date is not explicitly given.

convert: hg sink commits without working dir

convert: reintegrate file retrieval code in sinks It simplifies the sink interface and all the sinks to handle files data as they want.

context: add memctx for memory commits

merge with crew

coal: remove double template entry

localrepo: interpret ctx.filectx() exception as a missing file

localrepo: do not expose workingctx options These are implementation details and probably of no use to client code.

localrepo: extract _commitctx() from commit() _commitctx() takes a single changectx like argument. It gives way to commits from memory only.

context: let workingctx.date(), .user() and description() be overriden

localrepo: let commit() get extra data from workingctx

localrepo: hide commit() file selection behind workingctx

localrepo: replace dirstate by workingfilectx in filecommit()

context: let workingctx parents be overriden

graph: limit the number of displayed changest to a reasonable value

LookupError should have same __str__ as RevlogError

templates: graph lacked bottom search in default style

templates: fix navigation links for graph entries

make revlog.LookupError inherit from KeyError This will improve integration with external applications which depend on KeyError, which is usually raised by __getitem__ calls.

cvsps.py: remove unused Changeset member of logentry

tests: make new convert-cvs tests executable

graph: tweak the indentation algorithm