DS-1632 adding missing abstract into to XOAI QDC crosswalk
DS-402 changed item mapper search to case insesitive
DS-402 enable itemmap to search with both Lucene and Discovery
DS-402 Performance and UI improvements for itemmap

This commit remove hardcoded reference to the author index for both discovery
and lucene provider. The admin is now able to perform a generic search or choose
from one of the customized indices or filters.
A very simple pagination, only next and previous buttons, has been introduced to
avoid performance issues with large result set.
Finally has been introduced optimization to perform the "Not owning collection"
check and, limitly to discovery, authorization check directly as part of the
search.
Merge pull request #281 from LongsightGroup/DS-1632

DS-1632 adding missing abstract into to XOAI QDC crosswalk
DS-1634 XOAI OpenAire dc.relation filter is incorrect
DS-1624 Porting reset password admin UI tool to JSPUI
DS-1622 Porting of the Login As feature to JSPUI
Turn property from xmlui/jspui.user.assumelogin to webui.user.assumelogin, authorize jsp error featured with a custom message to display