Test restore (#103)

* pickle the AutoML object

* get best model per estimator

* test deberta

* stateless API

* pickle the AutoML object

* get best model per estimator

* test deberta

* stateless API

* prevent divide by zero

* test roberta

* BlendSearchTuner

* sync

* version number

* update gitignore

* delta time

* reindex columns when dropping int-indexed columns

* add seed

* add seed in Args

* merge

* stabilize SearchThread speed

* add seed

* fix import

* use except

* add restore test for CFO

* remove test_restore

* remove inspect

* remove print

* change to SearchThread._esp

* add _eps lower bound

* _eps in SearchThread

* add test_restore

* 1<<32

Co-authored-by: Chi Wang (MSR) <chiw@microsoft.com>
Co-authored-by: Chi Wang <wang.chi@microsoft.com>
Co-authored-by: Qingyun Wu <qiw@microsoft.com>