Fix share and search icon color.
Remove pointless fallback method for onOptionsItemSelected.

This makes it more obvious what's going on, and fixes the diff viewer
search action as a side effect.
Also strip off line numbers etc. from file names.
Show search instead of explore item in action bar.
Streamline sharing contents.
Remove share menu item for own user page.
Fix NPE when trying to search in diff.
Move search UI to action bar.