Introduce HG_PREPEND to solve pretxn races - add writepending to flush delayed writes to separate file - add support in hooks for lazy evaluation of callable parameters - add HG_PENDING to pretxn hooks - call writepending if hook is used - pass repo root to hook environment - if HG_PENDING = repo root, we're in pretxn hook - read pending data to make pending changesets visible - filter HG_PENDING in tests/printenv.py

rebase: pull --rebase updates if there is nothing to rebase

test-merge-tool: Make sure no hgmerge can be found in $PATH The merge tool selecting algorithm is hardcoded to look for hgmerge in $PATH before it falls back to use internal merge. This fixes the test for this fallback to be tolerant to existing hgmerges.

audit: check for casefolding of .hg (issue1450)

patch: teach selectfile about symlinks (issue1438)

mq: handle empty patches more gracefully (issue1501)

keepalive: borrow code from newer httplib to patch ValueError (issue1088)

rename: simplify forced renaming This should help work around virus scanner issues with rename on Windows.

log: ignore --removed if no files specified (issue1166) Otherwise we filter out merge changesets with no changed files

Don't fail on clone on win98 (issue1492)