orientation: add horizontal single axis tracking

[FabianHofmann]

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Related to #140

Test is with

import atlite
import pandas as pd

cutout = atlite.Cutout('test.nc', time='2019-05-30', x=slice(10,12), y=slice(40,42), module='era5')
cutout.prepare()

layout = cutout.uniform_layout()
panel = atlite.solarpanels.CSi

orientations = ['hsat', 'latitude_optimal', dict(slope=30, azimuth=180)]
ds = []
for orientation in orientations:
    ds.append(cutout.pv(panel, orientation, layout=layout).squeeze().to_pandas())

pd.concat(ds, keys=[str(k) for k in orientations], axis=1).plot()

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• [x] I tested my contribution locally and it seems to work fine.
• [x] I locally ran pytest inside the repository and no unexpected problems came up.
• [x] I have adjusted the docstrings in the code appropriately.
• [x] I have added a note to release notes doc/release_notes.rst.
• [x] I have used pre-commit run --all to lint/format/check my contribution

[FabianHofmann]

Output from the code

[codecov-commenter]

Codecov Report

Merging #220 (e97b52c) into master (6c69d51) will increase coverage by 0.10%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #220      +/-   ##
==========================================
+ Coverage   72.34%   72.44%   +0.10%     
==========================================
  Files          19       19              
  Lines        1580     1586       +6     
  Branches      222      222              
==========================================
+ Hits         1143     1149       +6     
  Misses        371      371              
  Partials       66       66              

Impacted Files	Coverage Δ
atlite/pv/orientation.py	91.66% <100.00%> (+1.19%)	:arrow_up:

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