all: update for Git

- rewrite .gitignore to use git patterns
- mv hg(1) to git(1) and rewrite
- add lib/git/commit-msg.hook
- add skeleton codereview script
- update codereview(1)

Change-Id: I061cd8e4de77ebbd6037a7c5d1582cd1d986f62f

man/man1/hg.1

@@ -1,111 +0,0 @@
-.TH HG 1
-.SH NAME 
-hg, cvs \- introduction to using plan9port Mercurial repository
-.SH SYNOPSIS
-.B hg
-.B clone
-.B http://code.swtch.com/plan9port
-.B plan9
-.PP
-.B hg
-.B pull
-.B -u
-.PP
-.B hg
-.B diff
-[
-.B -r
-.I revision
-]
-[
-.I path ...
-]
-.PP
-.B hg 
-.B serve
-.PP
-.B hg 
-.B view
-.PP
-.B web
-.B http://code.swtch.com/plan9port
-.SH DESCRIPTION
-The master source tree for Plan 9 from User Space is maintained
-using the source control system Mercurial
-as a substitute for Plan 9's
-\fIreplica\fR(8) and dump file system.
-.PP
-The first argument to
-.I hg
-is a command, which determines the form of the rest of the command line.
-.PP
-The
-.B clone
-command downloads a copy of the tree into the directory
-.BR plan9 ,
-which it will create.
-After
-.B hg
-.BR clone ,
-the other commands listed 
-should be run within the
-.B plan9
-directory tree.
-.PP
-Unlike CVS, Mercurial downloads the entire revision history
-of Plan 9 from User Space 
-in addition to the current tree.
-.PP
-.I Hg
-.I pull
-incorporates changes from the master repository
-into the local revision history.
-The 
-.B -u
-flag applies these changes to the current file tree.
-.PP
-.I Hg
-.I diff
-runs Unix's
-.IR diff (1)
-to compare the files in the local tree with the corresponding
-files in the revision history.
-By default it compares against the version that was most recently
-incorporated into the local tree.
-The
-.B -r
-flag specifies an alternate version to compare against.
-The special revision
-.B tip
-refers to the most recent version on the server.
-.PP
-.I Hg
-.I serve
-starts an HTTP server serving information about
-the local repository at the address
-.BR http://localhost:8000/ .
-.PP
-.I Hg
-.I view
-starts an interactive history viewer.
-.PP
-The Mercurial tree can be inspected on the web at
-.HR http://code.swtch.com/plan9port/ "" .
-.SH FILES
-.TP
-.B \*9/.hg
-directory containing Mercurial local repository
-.TP
-.B .hgignore
-list of files and wildcards to exclude from Mercurial operations
-.SH SEE ALSO
-.IR codereview (1)
-.PP
-Unix's
-\fIhg\fR(1),
-.HR http://www.selenic.com/mercurial/wiki/
-.PP
-.HR http://code.swtch.com/plan9port/
-.SH BUGS
-Plan 9 from User Space is no longer accessible using CVS;
-you must use Mercurial.