Licensing

[fdmalone]

Add NOTICE and copyright information to source.

[codecov]

Codecov Report

Merging #183 (5724e15) into develop (b18307b) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #183   +/-   ##
========================================
  Coverage    55.23%   55.24%           
========================================
  Files          165      165           
  Lines        23674    23677    +3     
========================================
+ Hits         13077    13081    +4     
+ Misses       10597    10596    -1     

Impacted Files	Coverage Δ
ipie/__init__.py	100.00% <ø> (ø)
ipie/analysis/autocorr.py	90.56% <ø> (ø)
ipie/analysis/blocking.py	34.70% <ø> (ø)
ipie/analysis/extraction.py	60.00% <ø> (ø)
ipie/analysis/tests/test_blocking.py	96.00% <ø> (ø)
ipie/config.py	62.50% <ø> (ø)
ipie/estimators/energy.py	97.56% <ø> (ø)
ipie/estimators/estimator_base.py	81.72% <ø> (ø)
ipie/estimators/generic.py	52.22% <ø> (ø)
ipie/estimators/greens_function_batch.py	86.18% <ø> (ø)
... and 74 more

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[linusjoonho]

LGTM