2014-04-22: adding prefinalized versions of
a) xtext editor generation file (xtext)
b) corresponding codegenration file (xtedn)
c) with xtext based purpose knowlede base editor generated databases:
* psiKedsLetterEnvelope.pkb
* psikedsTemplate.pkb
* w7LampDemoPurePsPvSemLeakFixed.pkb
* w7LampDemoPurePsPv.pkb
d) the automatically generated corresponding xml data bases
e) the psikeds.xsd as which corresponds to the xtext editor grammar

Note: all xml databases which are automatically derived from
the corresponding pkb-file validate against the psikeds.xsd

Verification: xmllint --noout --schema psikeds.xsd $(xyz).pkb.xml