Fix rendering of geometries in deegree

[stephanr]

Replacement of PR #1192
Original description:

This PR makes miterLimit configurable.
When the configured factor is exceeded portrayal changes from JOIN_MITER to JOIN_BEVEL (see https://docs.oracle.com/javase/tutorial/2d/geometry/strokeandfill.html).

Configuration can be set via JNDI-Env or System-Property.

Example:

<Environment name="deegree.rendering.stroke.miterlimit" value="2.66" 
                       type="java.lang.Float" override="false" 
                       description="deegree Rendering - Miter Limit Factor"/>

or

-Ddeegree.rendering.stroke.miterlimit=2.66

[copierrj]

Suggestion for a more explicit wording of this note:

As the internal workings of deegree are always evolving, the information in these chapters might become obsolete without any prior notice. There is no guarantee for anything described in here to be the same for future versions of deegree.

[tfr42]

+1