DsstK acceptance

 - add dump fix for setting B2DXFitters. In python script you can do now: 
    	from B2DXFitters.settings import setEnv
    	setEnv()
    and all classes/namespaces should be visible in the python 
  - update config files for DsstPi/K
  - small changes in MDFit plotting 
  - fixing fitSplines.py, calculateAcceptance.py, comparePDF.py with new 
    enviroment settings. 
  - allowing global weights in prepareWorkspace.py