Reduce REPL printing

By default PowerSystems.jl outputs to the REPL all Logging statements, which can be overwhelming in some cases.

Use configure_logging to create a logger with your preferences for which logging statements should be printed to the console or a log file:

Example: Set log output to only see error messages in the console

using PowerSystems
using Logging
configure_logging(; console_level = Logging.Error)

Note: log messages are not automatically flushed to files. Call flush(logger) to make this happen.

Refer to this page for more logging configuration options. Note that it describes how to enable debug logging for some log messages but not others.