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git/commit: change -a flag to -r

While '-a' works perfectly well to denote amending
a commmit in a vaccuum, unix users with muscle memory
may silently mangle their last commit. Using '-r' is
at least going to avoid that trap.

--- a/commit

+++ b/commit

@@ -75,7 +75,7 @@

 }

 fn parents{

-	if(! ~ $#amend 0)

+	if(! ~ $#revise 0)

 		parents=`{cat /mnt/git/HEAD/parent}

 	if not if(test -f .git/index9/merge-parents)

 		parents=`{cat .git/index9/merge-parents | sort | uniq}

@@ -118,7 +118,7 @@

 gitup

-flagfmt='m:msg message, a:amend'; args='file ...'

+flagfmt='m:msg message, r:revise'; args='file ...'

 eval `''{aux/getflags $*} || exec aux/usage

 if(~ $#* 0)

 	exec aux/usage

@@ -126,8 +126,9 @@

 msgfile=/tmp/git-msg.$pid

 if(~ $#msg 1)

 	echo $msg >$msgfile.tmp

-if not if(~ $#amend 1){

+if not if(~ $#revise 1){

 	msg=1

+	echo revising commit `{cat /mnt/git/HEAD/hash}

 	cat /mnt/git/HEAD/msg >$msgfile.tmp

 }

--- a/git.1.man

+++ b/git.1.man

@@ -36,7 +36,7 @@

 .PP

 .B git/commit

 [

-.B -a

+.B -r

 ]

 [

 .B -m msg

@@ -329,8 +329,8 @@

 .I -m

 supplies the commit message directly.

 The

-.I -a

-flag amends the contents of the previous commit, reusing the message.

+.I -r

+flag revises the contents of the previous commit, reusing the message.

 To a commit message,

 .I -a

 can be used in conjuction with