Interim combinatorial filters.
No tests as yet.
Re-center login.
Check types of fields for extract display values.

refs openhealthcare/elcid#179
Allow extract by bool fields

refs openhealthcare/elcid#179
Has AND & OR filter chaining.
Can remove filters.

refs openhealthcare/elcid#76
refs openhealthcare/elcid#166
Fix bug w. downloading multiple criteria.
Add filter discription file to download Zipfile.

refs openhealthcare/elcid#155
Include Extract footer.

refs openhealthcare/elcid#172
Add the username to an internal directory.
Change downloaded filename to "extract.zip".

refs openhealthcare/elcid#154
Adds datepicker for Bootstrap 3.X
Adds date filters to extract.

refs openhealthcare/elcid#77
Extract format differentiates between Freetext and coded entries where appropriate.

refs openhealthcare/elcid#147
Describe extract fields by labels not model names.
Adds Display name to schema.

refs openhealthcare/elcid#140
Hardcode Investigations fields.

refs openhealthcare/elcid#136
Working saved searches.
Fixes some tests.

refs openhealthcare/elcid#80
Add logging to extract download
Write extract to zip and then stream as file in one request.
Improves workflow, should work on Heroku.
replace names for labels
Hardcode OPAT into categories
Merge branch 'extract' into oapt
Cosmetic CSS changes to datepickers for BS3.x.
Add community personages, hourssince filters && some custom opat specialcasing