First attempt to include saga:clippointswithpolygons in the SVIR plugin's workflow
Correctly labelling points by zone, but problems building aggregation_layer
Fix problem building aggregation_layer (using attribute name for zone id taken from loss layer only if specified by the user)
while calculating stats aggregating by zone id, initialize sum and count to zero if a zone contains no loss points
Fix check of presence of SAGA working installation
Merge branch 'master' of github.com:gem/qt-experiments into huge-geometries
Merge pull request #19 from gem/huge-geometries

Use SAGA to cope with huge/complex geometries. If SAGA is not installed, use our previous approach.