git add: add long equivalents of '-u' and '-f' options

The option -u stands for --update and it is a good idea to make it clear
especially because this is the only mode of operation of "git add" that
does something different from "adding".  Give longer --force synonym to -f
while we are at it as well.

Signed-off-by: SZEDER Gábor <szeder@ira.uka.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git-add.txt

@@ -8,8 +8,9 @@ git-add - Add file contents to the index
 SYNOPSIS
 --------
 [verse]
-'git-add' [-n] [-v] [-f] [--interactive | -i] [--patch | -p] [-u] [--refresh]
-	  [--ignore-errors] [--] <filepattern>...
+'git-add' [-n] [-v] [--force | -f] [--interactive | -i] [--patch | -p]
+	  [--update | -u] [--refresh] [--ignore-errors] [--]
+	  <filepattern>...
 
 DESCRIPTION
 -----------
@@ -59,6 +60,7 @@ OPTIONS
         Be verbose.
 
 -f::
+--force::
 	Allow adding otherwise ignored files.
 
 -i::
@@ -75,6 +77,7 @@ OPTIONS
 	the specified filepatterns before exiting.
 
 -u::
+--update::
 	Update only files that git already knows about, staging modified
 	content for commit and marking deleted files for removal. This
 	is similar

builtin-add.c

@@ -200,8 +200,8 @@ static struct option builtin_add_options[] = {
 	OPT_GROUP(""),
 	OPT_BOOLEAN('i', "interactive", &add_interactive, "interactive picking"),
 	OPT_BOOLEAN('p', "patch", &patch_interactive, "interactive patching"),
-	OPT_BOOLEAN('f', NULL, &ignored_too, "allow adding otherwise ignored files"),
-	OPT_BOOLEAN('u', NULL, &take_worktree_changes, "update tracked files"),
+	OPT_BOOLEAN('f', "force", &ignored_too, "allow adding otherwise ignored files"),
+	OPT_BOOLEAN('u', "update", &take_worktree_changes, "update tracked files"),
 	OPT_BOOLEAN( 0 , "refresh", &refresh_only, "don't add, only refresh the index"),
 	OPT_BOOLEAN( 0 , "ignore-errors", &ignore_add_errors, "just skip files which cannot be added because of errors"),
 	OPT_END(),