First crude version for AddFocusTag

more functionality to come
Add jumpback to AddFocusTag
Merge pull request #1 from unifieddialog/add_focus

Command for AddFocusTag
Don't change last search and cursor position
Merge pull request #2 from unifieddialog/cursor

Don't change last search and cursor position
Introduce preserve function - fixes #3
Remove typo
Merge pull request #5 from unifieddialog/remove_duplication

Remove duplication