pyicon_tb.py pyicon_plotting.py: Added functions to make Polygon patch plot for primal and dual grid.

pyicon/pyicon_tb.py: Added info and stats for getting some information about arrays (at the moment only xarray arrays are supported).

pyicon/pyicon_tb.py: Added function asses_memory which should give an overview of the memory used by xarray objects.

pyicon_tb.py: Added option to specify in time_average which file is picked to identify dimensions for averaging.

pyicon/pyicon_tb.py: Added some potential candidate for another output function. However not in use yet.

pyicon/pyicon_tb.py: Better option for cropping data for interpolated data where lon_reg, lat_reg can directly be sepcified in interp_to_rectgrid. New function: write_dataarray_to_nc for netcdf output.

pyicont_tb.py: Added some basic xarray features to time_averaging. Removed dtype=IcD.dtype from some functions which do not know IcD.

pyicon/pyicon_tb.py and pyicon/quickplots/pyicon_quickplots.py: Bug fix in calculation time_bnds where mm=1 and we need to go to month mm=12 and yy+=-1.

pyicon_tb.py: Add verbosity to load_hsnap and allow for shifting the data if there is iw specified in case of lon>180.

pyicon/pyicon_tb.py: Added option of using a mask to only interpolate a selected domain in apply_ckdtree.

pyicon/pyicon_tb.py: Bug fixes related to loading amoc data and hfl data when looped over all time indices.

pyicon/pyicon_tb.py: Fixed bug in level interpolation (calc_vertical_interp_weights and zonal_average_atmosphere). New function nctime_to_datetime64 to calculate numpy.datetime64 objects from netcdf time.

pyicon/pyicon_tb.py: Changed radius_of_influence and convert np.nan in apply_ckdtree to masked values everytime (this was prob a bug before).

  * a bit of rearanging routines to get a more logical order
  * new intermediate function: ckdtree_points to calculate grid points
  * new function: calc_north_pole_interp_grid_points for a more
    appropriate grid for polar projections
  * new functions: spherical_to_cartesian and cartesian_to_spherical
  * splitting: mask_big_triangles

  * time_average: Added option to give list of indices over which should
    be averaged.
  * identify_grid: Added atmosphere r2b4 grid.

pyicon.quickplots: Adapted to new arrange_axes and adapted to splitting and moving of quickplot related functions to quickplot module.

Moving pyicon_quickplots and pyicon_view to their specific directories. Adding imports in __init__ files. Moving qp specific functions from pyicon_tb to pyicon_quickplots.py