Tapping fixes:
  Type dropdown box for tap tool was not filled in.
  Fix copy-and-paste error confusing drag-knife with tap tool.
  Tapping pitch was not being sent to post-processor. Use correct call to find the tool. The same incorrect call was fixed in a couple of other places.
Fix "Set all operations active / inactive" option
Merge pull request #26 from jb36/upstream

Tapping fixes: