* ENH add suppress validation option
* TST skip problematic doctest
* Rename SUPPRESS_VALIDATION to PRESUME_FINITE
* Change PRESUME_ to ASSUME_ for convention's sake
* DOC add note regarding assert_all_finite
* ENH add set_config context manager for ASSUME_FINITE
* Make ASSUME_FINITE private and provide get_config
* Fix ImportError due to incomplete change in last commit
* TST/DOC tests and more cautious documentation for set_config
* DOC what's new entry for validation suppression
* context manager is now config_context; set_config affects global config
* Rename missed set_config to config_context
* Fix mis-named test
* Mention set_config in narrative docs
* More explicit about limmited restoration of context
* Handle case where error raised in config_context
* Reset all settings after exiting context manager