extended python api
Revert "renamed the & columndefinition(..) methods to & columndefintionRef(..) to forestall problems with requesting undefined columns and expecting an undefined column instead of a exception"

This reverts commit 3f3694186ce0d1263882fa10ceb83ced8fbcb79f.
Merge branch 'master' of https://github.com/52North/IlwisConnectors
python api extended
Merge branch 'master' of https://github.com/52North/IlwisConnectors
changed casing of lookup in inifile
Merge branch 'master' of https://github.com/52North/IlwisConnectors
added silentmode when reading catalogs
Merge branch 'master' of https://github.com/52North/IlwisConnectors
fixed file lookup and georef string parsing
At creation of a map list band, the size property was not passed through correctly.
changes in python pixeliterator
Merge branch 'master' of https://github.com/52North/IlwisConnectors
better handling for csy unknown and undetermined georef
Solved bad georeference set to raster coverage
Merge branch 'master' of https://github.com/52North/IlwisConnectors.git
Merge branch 'master' of https://github.com/52North/IlwisConnectors
improved the type detection method for objects whose extension is not registered
added guard in ilwisType method agains not set working catalog
improved pixeliterator and fixed band function