mapfish linked with gt-8.7
unit test case for kml extended data is working.
identifie the version in the kml file
test with gt 8.6 result OK
comments
releas notes updated

Conflicts:
	RELEASE_NOTES.md
The exception  was documented
Merge remote-tracking branch 'mpazos/mapfishapp-unsupported-extended-data-cleanned'
updated RELEASE NOTES: no bugfix mentionned for new features ;-)