saga_gui, data_source_files: bug fix, workaround. linux testing needed
saga_gui, data_source_files: bug fix, further workaround (suppressing gtk warnings).
geostatistics, universal/ordinary kriging: bug fix, global search
shapes_points, thiessen polygons: clip to frame
Point Cloud Attribute Calculator: implement the new attribute addressing by field number or field name (warning: this is not backward compatible, but module execution will fail with error message in case the old addressing (a-z) is used); the new addressing allows to access fields with field numbers greater than 26; optionally add the calculated attribute directly to the input point cloud, i.e. do not create an output point cloud dataset
Table Calculator: issue error message and exit in case no attribute fields are specified in the formula
grid_tools: clip tool(s) reworked (and renamed, previously known as 'grid cutter')
grid_tools: reorganised menu structure
saga_cmd: bug fix, adressing table fields
Correct header path for opencv/cv.h (Rainer Hurling)
Fix gcc security warnings

Enables building on debian with all gcc hardening flags