application: small fixes for the session library
application: small fixes for the session library

  -) mark the session as not started after a close
  -) regenerate does no longer delete the old session

pprkut/lunr,tardypad/lunr,pprkut/lunr,tardypad/lunr,M2Mobi/lunr,pprkut/lunr,M2Mobi/lunr,tardypad/lunr,M2Mobi/lunr