Post Release Fixes

[jkroenke]

A few bug fixes, new sphinx theme, progressbar working again, and increased test coverage with unit tests instead of doctests as well as a code coverage badge (base repository still has to be linked to codecov and the badge link in the readme has to be adapted when merging the pull request).

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@51b7d0d). Click here to learn what that means.
The diff coverage is 59.36%.

@@           Coverage Diff           @@
##             master   #125   +/-   ##
=======================================
  Coverage          ?    48%           
=======================================
  Files             ?     44           
  Lines             ?   6877           
  Branches          ?      0           
=======================================
  Hits              ?   3301           
  Misses            ?   3576           
  Partials          ?      0

Impacted Files	Coverage Δ
pyunicorn/climate/tsonis.py	94% <ø> (ø)
pyunicorn/climate/spearman.py	100% <ø> (ø)
pyunicorn/core/data.py	46.48% <ø> (ø)
pyunicorn/utils/__init__.py	100% <ø> (ø)
pyunicorn/funcnet/event_synchronization.py	89.83% <ø> (ø)
pyunicorn/funcnet/coupling_analysis_pure_python.py	12.23% <ø> (ø)
pyunicorn/climate/coupled_tsonis.py	82.75% <ø> (ø)
...corn/timeseries/inter_system_recurrence_network.py	69.87% <ø> (ø)
pyunicorn/funcnet/__init__.py	100% <ø> (ø)
pyunicorn/core/netcdf_dictionary.py	23.07% <ø> (ø)
... and 33 more

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