Do license review:
 * add licenses to maven pom.xml files
 * enable 52n licensing mechanism for Maven
 * add some license dependend resources to misc folder
 * license switch from GPL to ASL
 * Adding license headers to OGC schemas via Maven plugin
 * Add license header to W3C xlink schema (was missing)
 * Add license header to OASIS election and rim schemas (were: missing)