Fixed reinstantiate to clear markers before reinstantiting.
changed interface of reinstantiate single file
fixed insatntiate command in Xtext editor to not follow the reference of
the current position, but idneetify the enclosing object containing the
reference.
Separate Update and Reset plugin resources commands.
Support for goto declarative model from instance model.

Last of several improvements listed in Issue #203
Merge remote-tracking branch 'origin/develop' into develop