Fix #222, done a little rework on `IRAPY/customlogging.py` module. (#224)

Added an internal method in the CustomLogger class that recursively replaces the `<` and `>` characters in exception strings with `{` and `}` respectively before logging them.
Also now the `logException` method logs the name of the calling method to the user correctly (before this fix the caller appeared to be `logException` with no further informations).