First pass at advanced search screen and limiters.
Merge pull request #1 from atz/mmilton_master

Whitespace cleanup (dos2unix, s/ $//g)
merging
cleaning up
cleanup
Corrected HTML availability check.
Added side facet override caption
removed some debug text
Removed un-used control
Reverted mistakenly checked-in change.
Replaced '<br/>' in item data with ', ' to save space.
Implemented the converting of the publication date filter to an EDS API
limiter.
dos2unix
Normalize formatting (replace tabs) and extend AbstractBackend

Conflicts:
	module/VuFindSearch/src/VuFindSearch/Backend/EDS/Backend.php