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>

t/t1200-tutorial.sh

@@ -159,4 +159,3 @@ test_expect_success 'git prune-packed' 'git prune-packed'
 test_expect_failure '-> only packed objects' 'find -type f .git/objects/[0-9a-f][0-9a-f]'
 
 test_done
-