War on whitespace

This uses "git-apply --whitespace=strip" to fix whitespace errors that have
crept in to our source files over time.  There are a few files that need
to have trailing whitespaces (most notably, test vectors).  The results
still passes the test, and build result in Documentation/ area is unchanged.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

gitk

@@ -337,7 +337,7 @@ proc readrefs {} {
 		    set tagids($name) $commit
 		    lappend idtags($commit) $name
 		}
-	    }		
+	    }
 	    catch {
 	        set tagcontents($name) [exec git cat-file tag $id]
 	    }