Add fix-test and test/tmp/* targets for updating screen

[paulwkc]

Add fix-test and test/tmp/* targets for updating screen

Update screen files wrt .test-result using make targets:

1. fix-test target to apply patches

   make fix-test
   

2. test/tmp/* target to apply patch for specific test

   make test/tmp/diff/diff-stat-test
   

Note:

1. DEBUG=1 make test/tmp/diff/diff-stat-test for debugging (dump commands to stderr and dump diff to stdout).
2. patches means the files .test-result under test/tmp/*/