allow adding whole diff to patch

this was causing a panic

add integration test for toggling all commit files

test/integration/patchBuildingToggleAll/setup.sh

@@ -0,0 +1,23 @@
+#!/bin/sh
+
+set -e
+
+cd $1
+
+git init
+
+git config user.email "CI@example.com"
+git config user.name "CI"
+
+git commit --allow-empty -m "first commit"
+
+mkdir -p one/two/three
+echo test1 > one/two/three/file1
+echo test2 > one/two/three/file2
+echo test3 > one/two/three/file3
+echo test4 > one/two/three/file4
+echo test5 > one/two/file1
+echo test6 > one/two/file2
+
+git add .
+git commit -m "blah"