[maven-release-plugin] copy for tag org.gvsig.tools-3.0.13
Add or update headers to the current gvSIG Association one.Updated while in the Code Copyright Review for the OSGEO incubation process report.
Add unit tests and correct some Coercion implementations. Also separate the CoerceToDate to three different coercers for DATE, TIME and TIMESTAMP data types.This fixes bug gvsig-desktop#15643.