Simpler solution to grafting SimpleXML trees.
OAI server validation
- Improved standards compliance
- More detailed error messages
- Detailed date validation
- Resolves VUFIND-1060
Style fix.
Updated to latest alphabrowse handler.
Removed deprecated bootstrap/bootprint themes.
Improve screen-reader accessibility.
Implementation of support for hierarchical facets.
Merge remote-tracking branch 'upstream/master'

Conflicts:
	module/VuFind/src/VuFind/Controller/OaiController.php