ENH: Add system R2 measures

[bashtage]

Add McElroy's measure and Berndt's measure
Clarify overall is Judge's measure

[codecov]

Codecov Report

Merging #225 into master will decrease coverage by 0.01%.
The diff coverage is 99.78%.

@@            Coverage Diff             @@
##           master     #225      +/-   ##
==========================================
- Coverage    99.7%   99.69%   -0.02%     
==========================================
  Files          83       82       -1     
  Lines       14450    14537      +87     
  Branches     1420     1434      +14     
==========================================
+ Hits        14408    14493      +85     
  Misses         11       11              
- Partials       31       33       +2

Impacted Files	Coverage Δ
...nearmodels/tests/system/test_3sls_against_stata.py	100% <ø> (ø)	⬆️
linearmodels/tests/system/test_gmm.py	98.38% <ø> (ø)	⬆️
linearmodels/tests/test_utility.py	100% <ø> (ø)	⬆️
linearmodels/tests/system/test_utility.py	100% <ø> (ø)	⬆️
linearmodels/tests/system/test_formulas.py	100% <ø> (ø)	⬆️
linearmodels/tests/system/test_sur.py	100% <ø> (ø)	⬆️
linearmodels/tests/system/test_equivalence.py	100% <ø> (ø)	⬆️
...inearmodels/tests/system/test_sur_against_stata.py	100% <ø> (ø)	⬆️
linearmodels/tests/system/test_3sls.py	100% <ø> (ø)	⬆️
linearmodels/tests/test_examples.py	100% <ø> (ø)	⬆️
... and 80 more

---

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[pep8speaks]

Hello @bashtage! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file linearmodels/_version.py:

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Comment last updated at 2020-01-09 12:50:19 UTC