fixes SAGA 2.1.2 merge raster layers module as it changed name and parameters
[processing] remember min/max value in number params in modeler
[processing] removed redundant saga algorithm
[processing] fixed table export
fix SAGA 2.1.2 Sort Grid module: name and parameters changed
[processing] removed repeated algorithms from simplified mode
[processing] disabled editing modeler item with double click (was causing crash)
Merge pull request #1636 from gioman/saga_mosaick

fixes SAGA 2.1.2 merge raster layers module as it changed name (now "mosaick") and parameters
Merge pull request #1637 from gioman/saga_grid_cell_index

fix SAGA 2.1.2 Sort Grid module: name and parameters changed
Merge remote-tracking branch 'origin/master' into brighton