Added an Error Message, in case of assigning a range gate array with less than two values to
georef._get_range_resolution()

additional parameter (range_resolution) for functions polar2centroids and
projected_bincoords_from_radarspecs, just for the case the sitecoords shall be
calculated from one range, the resolution cannot be derived from the range array
(_get_range_resolution)

changed io.readDX in a way that the elevations and azimuths are returned anyway
as an attrs-dictionary. By the way the DX data is now immidiately
converted to dBZ data in the readDX function. Just can't imagine that anyone
needs the RVP6-units. And if so it can be easily converted back.

Added contstrained attenuation correction routine.
Extended iterations to reduce parameter b as well, if first iteration of a won't
fulfill all constraints.

remove old cluttercor image

changed cluttercorrectio tutorial
added the figure closure in vis

fixed bug that occurs when reading a great many of netCDF-files (the have to be closed explizitly)

added PolarPlot class and polar_plot2 function.
class PolarPlot is a an attempt to refactor the plotting capabilities of
the polar_plot function into something that provides more flexibility when
creating custom plots while avoiding large function signatures and an...

added arguments classes and extend to vis.polar_plot

<classes> is a sequence of class boundaries. Colors are assigned according to the
class boundaries and the colormap argument. It is recommended to use this plotting
mode because the behaviour of automatic stretching is quite unpredictable....

further edits on tutorial_reading_dx

editing the tutorial_reading_dx

several modifications in the documentation concerning

index: added some introductory text and an image (we can replace that) in order to create a nice welcome

getting started: much more details in order to make things easier for Python newbies

tutorials: minor edits...

Removed autogenerated files from version control

made vis.polar_plot behave nicely when fig keyword argument is set but not
axpos argument.

added clutter tutorial

merged Revisions 146 and 148

added a draft for a new map plot function for grids in vis.py ...but is not operational, yet.

limited the range array in read_EDGE_netcdf according to range_lim

dummy push

io.read_EDGE_netcdf:
changed all range units to meters (SI-convention)
added the range_lim default and the unit-specification to the docstring