RNDT: squash commit.

RNDT: fix multiple parentIdentifier returned by CSW iso-full	etj
Fixing the uom visualizzation for gmd:resolution element	tobia
Updating the README with the config-overrides information	tobia
Fixing connectPoint element according to the rndt cardinality	tobia
Small fix for the linkage/phone check				tobia
Remove unnecessary collapsible fragments in edit mode		tobia
Introducing the specific RNDT linkage/phone check from GUI elements		tobia
Refined a bit some occurrences in xsd				tobia
Fixing the gmd:pass element management				tobia
RNDT: fix schema: phone is not mandatory			etj
RNDT: do not show attributes when editing time extent		etj
RNDT: removing empty keywords					tobia
RNDT: remove hhmmss from time extent				etj
Updating the parentIdentifier tooltip content			tobia
Enabling inspire's serviceType suggestions			tobia
Introducing suggestions for vertical CRS selection		tobia
Fixes on rndt schematron, templates, suggestions and presentation xsl.	tobia
Fixed some traslation in label.xml file				etj
Added toISO19139.xsl conversion file to fix problem in ZIP exporting on multiple RNDT metadata selection ddgis
Added temporal and vertical extension sections in templates	ddgis