refined init_model: allow change of buffer name as caused by "Save as", for example; avoid init_model while buffer.isLoading -- potentially prevent NPE of getText; avoid emitting nested buffer.propertiesChanged events;

basic support for bundled declarations;

doc update

made "spass" a "metaprover" that uses either the new SPASS or the old SPASS, to preserve backward compatibility and prepare for the upcoming release

removed obsolete temporary hack

tweaks

proof tidying