builtin-rm: Add a --force flag

This adds a --force flag to git-rm, making it somewhat easier for
subversion people to switch.

Signed-off-by: Pieter de Bie <pdebie@ai.rug.nl>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git-rm.txt

@@ -7,7 +7,7 @@ git-rm - Remove files from the working tree and from the index
 
 SYNOPSIS
 --------
-'git rm' [-f] [-n] [-r] [--cached] [--ignore-unmatch] [--quiet] [--] <file>...
+'git rm' [-f | --force] [-n] [-r] [--cached] [--ignore-unmatch] [--quiet] [--] <file>...
 
 DESCRIPTION
 -----------
@@ -36,6 +36,7 @@ OPTIONS
 	but this requires the `-r` option to be explicitly given.
 
 -f::
+--force::
 	Override the up-to-date check.
 
 -n::

builtin-rm.c

@@ -131,7 +131,7 @@ static struct option builtin_rm_options[] = {
 	OPT__DRY_RUN(&show_only),
 	OPT__QUIET(&quiet),
 	OPT_BOOLEAN( 0 , "cached",         &index_only, "only remove from the index"),
-	OPT_BOOLEAN('f', NULL,             &force,      "override the up-to-date check"),
+	OPT_BOOLEAN('f', "force",          &force,      "override the up-to-date check"),
 	OPT_BOOLEAN('r', NULL,             &recursive,  "allow recursive removal"),
 	OPT_BOOLEAN( 0 , "ignore-unmatch", &ignore_unmatch,
 				"exit with a zero status even if nothing matched"),