Add CGMES file name convention support in ipst as described in ENTSO-E specification document ([File name convention operational data exchanges.pdf](https://github.com/itesla/ipst/files/312436/File.name.convention.operational.data.exchanges.pdf))
Add CGMES file name convention support in ipst as described in ENTSO-E specification document (File name convention operational data exchanges.pdf)