added preliminary version of lqe function, which calculates the gain …#351

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murrayrm merged 2 commits intopython-control:masterfrom

sawyerbfuller:master

Dec 30, 2019

Commits on Dec 10, 2019

added preliminary version of lqe function, which calculates the gain for a steady-state Kalman filter.
sawyerbfuller
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Commits on Dec 12, 2019

LQE: added python 2 compatibility and unit test
sawyerbfuller
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