[processing] fixes issue in saga with multiple inputs
[processing]code cleaning
[processing]modified v.overlay description
Added "eliminate sliver polygons" algorithm skeleton(still a draft first version)
[processing] corrected parameter definition in Eliminate
test models and scripts are now hidden
[processing] modeler now warns before closing if there are changes
[processing] changed log and config filenames
[processing] saga fixes. "2.0.8 is now default target version
[processing] some code cleaning