v1.6 release note (microsoft#2491)

Merge pull request microsoft#2282 from microsoft/master

release v1.4

NNI release for v1.3

Release note (microsoft#1809)

Fix package installation in virtualenv and conda (microsoft#1640)

* Refactor package installation

* reformat docstring

* fix issue when user is root

Chinese translation (microsoft#1468)

 New translations (Chinese Simplified) for v1.0

fix for no local gpu agents

Fix bug of nnictl about stopping experiment and update statsmodels ve…

…rsion to v0.9.1.1 (microsoft#1297)

* update statsmodel for bohb

* fix nnictl stop experiment bug

* fix nnictl stop experiment bug

* fix nnictl stop experiment bug

delete font (microsoft#1245)