compiler warnings resolved
Merge pull request #86 from IDgis/database-cleanup

compiler warnings resolved
wrong Loader reference in LoaderSession props fixed
Merge pull request #87 from IDgis/loader-fix

wrong Loader reference in LoaderSession props fixed
null handling bugfix
debug output added
final added to executeQuery()
loader session is now terminated on database error
Merge pull request #88 from IDgis/database-fixes

Database fixes