Might fix #7072
Merge branch 'dev' of github.com:nysenate/Bluebird-CRM into dev

* 'dev' of github.com:nysenate/Bluebird-CRM:
  refs #6723 prev/next caching
  refs #7090 export minor code refactoring
  partial fix for custom search export
  refs #6109 add option to simply purge data from an instance