mergetools.hgrc: add minimal configuration for editmerge The ``editmerge`` script is shipped in contrib and opens an editor on every conflicting file. It needs minimal configuration to inject the config marker in the file before opening. Otherwise it behaves the same as ``internal:local`` and bad things happen.

merge with stable

convert: drastically speed up git conversions We would formerly exec git cat-file once for every commit, plus once for every tree and file we wnated to read. This switches to using git cat-file's batch mode, which is much, much, much faster. Using this new code, converting the git git repo to hg ran in 106 minutes on my machine. Using the stock mercurial, it required 1239 minutes. I believe this to be typical of the speedups we will see form this patch.