Patch to fix `org-babel-result-end' command to provide consistent result
removal where result is type `wrap'. 

Prior to this fix multiple (org-ctrl-c-ctrl-c) commands will add
multiple newlines to the end of results (one newline per block
execution).

This patch also fixes the test
`test-ob/org-babel-remove-result--results-wrap' which is uncommented in
the patch.

Best, Martyn