tmva/utils.py: string path to ROOT dir
tmvaconfig: conf file parsing, and types method
tmva: typo in filename
tmva: minor yaml rename
tmvaconfig: code clean-up
tmvaconfig: diff short name for TMVAType
classify.py: configurable MVA options
tmvaconfig: remove checks for valid properties

Hinders in adding new ones, as I extend the format
tmvaconfig: docstring fix
tmvaconfig: new properties
tmva: remove toy settings
tmvaconfig: add checks for mandatory options

Also update default conf file
classify.py: take options from conf file