implemented GaussianGrid
(cherry-picked from 969170c)
split GaussianGrid into reduced and regular in order to be conform with current convention
(cherry-picked from 62e8123)
removed a lot of deprecated things
(cherry picked from commit 036a3453fcf2e31bb190c15b2a737ace4260cf7e)

Conflicts:
	beam-core/src/main/java/org/esa/beam/framework/datamodel/Product.java
	beam-mosaic/pom.xml
	beam-mosaic/src/main/resources/module.xml
	beam-time-series-tool/src/main/java/org/esa/beam/timeseries/export/animations/AnimatedGifExport.java