Mindsdb

features:

- integration with PostgreSQL
- improvements of HTTP routes for DB config
- route for datasource analysis now not blocking

fixes:

- all passwords from config now read as strings

tests:

- tests for integration with PostgreSQL

Fixed typo

features:

- integration with MySQL

fixes:

- `DataStore.save_datasource` received info for saving DS from 'default_' integrations keys

Fixes:

- filtering by timestamp through sql interface
- 'insert predictor' will work well if 'column = null' in query

minor fixes

features:
- config migration and validity check at start
- if no specify in config 'certificate_path' or set it to empty string, then on start will be created temp ssl cert.

fixes:
- mindsdb ignored storage_dir for mindsdb_native passed in --config arg and used it from default config instead.
- escape predictors name when create related tables in databases.

tests:
- added tests for 'external_datasource'