[maven-release-plugin] prepare release 52n-common-xml-1.1.6
adjust git scm provider in release profile
revert version to SNAPSHOT
increase version number
increase next development version
remove unicode characters from license header
update schemas from http://schemas.opengis.net
fix automatic setting of xsd license header which removed whole schema when first line was a comment in original xsd. Now an OGC LICENSE HEADER marks the actual start of the license header so that the original comment is not touched
Merge tag 'v1.1.6'
make release from master before switching to 1.1.7-SNAPSHOT