Add ST_Force2D and ST_Force3D functions
Clone the geometry before changing coordinate dimension
Merge remote-tracking branch 'remotes/upstream/master' into geometryEditors

Conflicts:
	h2spatial-ext/src/main/java/org/h2gis/h2spatialext/CreateSpatialExtension.java
	h2spatial-ext/src/test/java/org/h2gis/h2spatialext/SpatialFunctionTest.java
Merge remote-tracking branch 'remotes/upstream/master' into geometryEditors

Conflicts:
	h2spatial-ext/src/main/java/org/h2gis/h2spatialext/CreateSpatialExtension.java
	h2spatial-ext/src/test/java/org/h2gis/h2spatialext/SpatialFunctionTest.java
Fix merge pb with intelij UI
Improve st_buffer signature.
The user can now set specific buffer style parameters.
Fix javadoc and geometry clone
Merge pull request #250 from ebocher/geometryEditors

Add ST_Force2D and ST_Force3D functions.

Fixes #40.