313 Multiple form types for a single widget

[juzen2003]

• The is the pull request to track issue: #313

• Implementation done:

  • phase 1: Allow sub-categories in checkbox fields. Allow multiple levels of sub-category.
    • Now grouping field can store directory tree like main_cat/sub_cat1/sub_cat2

• Steps to test (phase 1):

  1. In config_targets.py, replace the normal PLANET_GROUP_MAPPING to the commented out one and re-import the test database.
  2. Intended target name widget will have multiple level of sub categories shown. Each level can have a mix of checkboxes and sub-category.