refs #11810

* updated @local/dev/config/vufind/FincILS.ini.sample@ for testing against daia/paiawachtl
* changes to class @finc\ILS\Logic\Holds@:
	** changed @getHoldings@ as super method changed: copied super method and added call to @processEmailHolds@
	** changed method @processEmailHold@: copied @processILLRequests@ from super class and adjusted strings
	** removed @getBlockedEmailHoldDetails@ since not needed anymore
	** changed @formatHoldings@ as super method changed; TODO: check whether @purchase_history@ gets correctly handled
* adjusted @themes/finc/templates/RecordTab/holdingsils.phtml@ due to changes of returned values by @finc\ILS\Logic\Holds::getHoldings@
* created @themes/finc/templates/search/searchTabs.phtml@ to test whether variable @$searchTabs@ actually exists