Fix/mip 42/logistic regression bugs

Created by: jassak

Running version of Logistic Regression

Fixes:

• real/float/double typos in various places
• Name url was used for socket address, which caused a bug in monetdb_interface.remote_tables and tasks.remote_tables
• UDF_REGISTRY was empty because algorithms module was not imported
• Rename monetdb_url to monetdb_socket_addr in AlgorithmExecutor

There is still a bug in validate_identifier_names. A fix is planned so I just commented it out here.