check for addFS with wrong Sofa misses many paths

The docs say that subtypes of AnnotationBase can only be added to indices in the CAS View associated with the Sofa for that Feature Structure (see http://uima.apache.org/d/uimaj-2.6.0/tutorials_and_users_guides.html#ugr.tug.aas.annotations_associated_sofa )

A check was put in to enforce this, in the casImpl code, when calling aCasView.addFsToIndexes. Unfortunately, this check misses checking the many other paths that are used to add a FS to an index. For instance, the path when using JCas: instance.addToIndexes(), and many others.

Fix this by moving the test downwards to the place where all code paths flow together.

Allow restoring the old behavior in case needed, via a JVM -D parameter: uima.disable_enhanced_check_wrong_add_to_index