* Replace logging backend to flexi-logger and add log rotation
* Changed flexi_logger to log4rs
* Disable logging level filtering in Root logger
* Support different logging levels for file and stdout
* Don't log messages from modules other than Grin-related
* Fix formatting
* Place backed up compressed log copies into log file directory
* Increase default log file size to 16 MiB
* Add comment to config file on log_max_size option
* config file can now be generated by executable
* rustfmt
* remove now-unnecessary config defaults test
* set up paths and config file creation in user's home directory
* rustfmt
* remove default grin.toml
* add grin configuration command to spit out config file
* Split configuration into wallet and server
* rustfmt
* Restore logging to wallet configurations
* rustfmt