Change configure_log_file function to accept arguments with or without a file extension

[AndreLaranjeira]

Currently, the configure_log_file function works by receiving a file name argument that must have an extension. Change the current behavior in the following ways:

1. Create a function to breakdown a file argument into the file name and the file extension;
2. Change the configure_log_file to add a default extension (.log) to any argument supplied without an extension and to give a warning when the filename argument has a different extension to it than the default one or is a hidden file (file name empty);
3. Add functionality to the make clean command in the Makefile to prompt the user to the delete any files with the default log file extension.

Important: If this change damages the old usage of the function, it should be included in a major release, not a minor release or patch.