Fix DeprecationWarnings from pyparsing

[davlee1972]

Example:

Line 454 in config_parser.py..

parseString argument is deprecated. Use parse_string.

Args in functions in the pyparsing package have changed from camel casing to snake casing.

There are 19 function calls which need to be updated between config_parser.py and period_parser.py.

[lbenka]

seems to be addressed here #337