Make use of ~/rl_data for storing large files

[J535D165]

This pull request changes the download location of the krebsregister data. Instead of storing the downloaded files in site-packages, we store it now in ~/rl_data or the location specified by environment variable RL_DATA.

You can get the location by

from recordlinkage.datasets import get_data_home

get_data_home()

#42

[codecov]

Codecov Report

Merging #92 into master will increase coverage by 0.1%.
The diff coverage is 94.44%.

@@            Coverage Diff            @@
##           master      #92     +/-   ##
=========================================
+ Coverage   76.68%   76.78%   +0.1%     
=========================================
  Files          33       33             
  Lines        2333     2348     +15     
  Branches      377      379      +2     
=========================================
+ Hits         1789     1803     +14     
  Misses        415      415             
- Partials      129      130      +1

Impacted Files	Coverage Δ
recordlinkage/datasets/__init__.py	100% <100%> (ø)	⬆️
recordlinkage/datasets/external.py	94.23% <93.33%> (-0.65%)	⬇️

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