[PATCH 0 of 5] Add grep command

[Bryan O'Sullivan]

This patch series adds a grep command.  It does not yet search history,
but it is useful as it stands, and I'll be building on it.

(Also, this series is a test of a new script I wrote to generate series
of patches.  I'll be sending it separately.)

    <b
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3 files changed, 141 insertions(+), 41 deletions(-)
doc/hg.1.txt           |   32 ++++++++++
mercurial/commands.py  |  143 +++++++++++++++++++++++++++++++++++-------------
mercurial/fancyopts.py |    7 +-