enhancing the 1-d adjustment example and adding a verification to this; minor
changes in the merify module

minor doc related edits in georef and dev_setup.rst

Added new adjustment method AdjustMixed with a combined additive and multiplicative
error model (according to Thomas's idea). Enhanced the 1-d application example
accordingly. We should maybe try to define a more illustrative 1-d example.

change in setup.py in order to avoid exception when compiling BUFR under Linux -
still needs to be tested!

added class ErrorMetrics to wradlib.verify

ErrorMetrics computes performance metrics (such as RMSE, Nash, ...) from a set
of observations (e.g. gage) and estimates (e.g. radar) and also print error reports
and scatter plots.

minor edit in gettingstarted.rst

moved _idvalid from adjust to util

added a message in case not enough gages are available for adjustment...

added wradlib logo to doc pages sidebar

some minor edits in dev_setup, getting_started and team, particularly including several
references to wradlib-users.

added a multiplicative gage adjustment (adjust.AdjustMultiply); harmonization of
all adjustment classes; removed a bug so that radar value at gages can also be
retrived in case only the one nearest neighnour is considered; developed a 1-d
adjustment example and added this to library reference and to adjust_example.py

minro edit in vpr

removed a bug from AdjustAdd in case missing values are present; minro edits in adjust_example.py

added a 1d example to adjust_example.py; modified AdjustAdd to deal with
missing values

added an outline for a function to create a CAPPI in module VPR and added some explanatory
text about significance of VPR

Merge with default

--HG--
branch : feature/tp/kriging

minor edits in rhi_plot related docstrings, included rhi_plot test version in library reference.

added code for rhi_plot provided by Kai Muehlbauer - but not tested, yet!

minor edits in io (particularly change in package import order)

Added reader for GAMIC HDF5 data to wradlib.io.read_GAMIC_hdf5 and added a short
section to the tutorial_supported_formats.rst document.