move plan list settings from project to plan

merge in changes from origin

first port of plan creation and editing to new data model

switched visibility over to an enum. updated the project objects accordingly. Added some more unit tests. Updated locale files with visibility text

Added initial public DMPs page to display public plans to unauthenticated users

Added logic to display the correct visibility based on whether the project is_test or is_public or neither

fixed issue with settings data saved to the DB using an old version of the gem. stripped html tags from question text for display in the export form.

fixed issue with plan list column display issue

Added fix for issues when displaying column headings on the view plans page. Setup and 'Unknown' column heading that defaults to ' - ' but is updateable in the locale files. If there are issues determining the column heading it will use that value