XLinks not resolving because null Service Context in detachXLinks
Remove override that caused database connections to be consumed
when calling local services
Allow failures to stop xlink processing for general usage
Fix for #509
Move fragment harvester from urls to local://
Move thredds harvester to local://
#511 GetCurrentMDTab service should retrieve the default view from the settings
Merge pull request #505 from anzmest/xlink_fixes_210x

XLink fixes for 210x
Remainder of fix for #506
Adding (deactivated by default) a button next to label fields to show a help pop-up.
This is useful when the current help text is too long. If you try to scroll down on the current help window, you will overmouse over other fields, changing the text on the help window.
Merge branch '2.10.x' of github.com:geonetwork/core-geonetwork into 2.10.x