Read DTYPA and DTYPP parameter to determine storage format:
Created by: jtrebosc
SSNake cannot read properly some topspin 4 datasets that are stored in float64 format. The pull request will add this feature. It reads DTYPA for fid/ser files and DTYPP for processed files. The dtype is updated for byteorder stored in BYTORDA and BYTORDP. Then the data are read using the right dtype. No need to fix afterwards the byte order.