* update comments for plot_transection.py in smallbaselineApp

* utils.get_geometry_file() support checking of a list of datasets

* check both incidenceAngle and azimuthAngle while calling utils.plot.plot_gps()

* prep_aria: do not create azimuthAngle dataset if no azAngle file is input

* stackDict: remove UNIT metadata while loading ifgramStack and geometry* files

* disable GPS related options in tsview.py for now because "insar displacement vs gps displacement" is not implemented yet.