fix #08055: error when accessing quota menu

DEV: reference "Permission::model() was missing
Merge pull request #99 from mfaber/quota_permission205

Fixed #8055: Error when accessing quota menu
Plugin based on R-plugin
crude stata header
structure and trying sql->xml
Prinzip ok: vlabel
cleanup, start fieldmap
Clean strings, cleanup
cleanup, restructured
vlabel ok
strip tags, US-ASCII
cleanup
import to STATA works!

data, format and type missing (fieldmap)
restructure, cleanup
validate varmames
cleanup
add survey variables to fieldmap
rename value labels
moved contents from stataXML to close()
cleanup