Impact Function Centric Wizard

This PR contains:
- the wizard itself
- WizardAnalysisHandler class, that basically duplicates the dock code for running the analysis and composing the reports. It should be probably abstracted in the future.  
- an additional signal in ExtentSelectorDialog to call it from the wizard
- changes to ImpactFunctionManager and ImpactFunctionMetadata, that were present in Ismail's branches the wizard is based on, but seems they are not merged to develop yet.  Ismail - please take a look if the changes are complete.