Added option to allow for grouping, including in print view. Option is in Option dialog.
Added F2 to edit or update task, same as in Windows Explorer. Will automatically more the cursor to the end of the line when updating.
Merge pull request #139 from kevininspace/F2_to_edit_task

Added F2 to edit or update task, same as in Windows Explorer.
Minor refactor
merging conflict
Version 2.1.0