Tag assignments can be deleted accidentally

[tklein]

At the moment it is fairly easy to delete tag assignments accidentally. This is especially painful if a bigger number of verses is affected. The UI should confront the user with a confirmation dialogue as soon as he tries to delete tag assignments for more than 1 verse.

[tklein]

(In [187])

• Adaptions that are part of the solution for the splitted verse inconsistencies (see #129)
  • Added attribute "verse_part" to verse_tags and verse_notes (see new migration scripts),
  • verse_tags are not destroyed by the ids anymore. Instead we take the verse references as unique identifier.
  • The tags of a verse are now fetched with the verse_part as parameter (changed Verse.tags)
  • Adapted Tag.create_or_find_from_user_data (added verse_part parameter)
  • Adapted controller functions in assigned_tags_controller and tagged_verses_controller

• Properly handle the creation of sections that contain both other sections and verses (fixes #121)
  • Added OutlineSection?.is_within_passage
  • Added OutlineSection?.move_to_new_parent_section
  • Check inner sections of new section container upon creation and create the appropriate data elements within section_tree
  • Adapted verse_range jquery selector so that it would also match section elements within a passage

• Show a confirmation dialog before removing tag assignments for a verse list longer than 1 verse (fixes #108)
• Show a confirmation dialog before moving verses with the result of dissolving a section (fixes #102)
• _verse_box.erb => Only query verse note if the currently computed verse really has one (Performance improvement)
• Refactored the tag-data-element that contains the tag information within the verse list
• Fix some event handling issues with the bible browser checkbox buttons
• Remove local tags from verse_list upon destruction of a tag
• Show note and tag indicators permanently. Now these indicators are gray if no tags or notes are available, and blue if so.
• Reduze font-size of dialogs