Add support for EC-Lab v11.50

Rebased from echemdata#95 by @JhonFlash3008

…p_index and timestamp from the temporary _LOOP.txt and .mpl files during MPRfile initialization

Added unitary tests but cannot upload test files due to LFS quota exceeded

from 498 to 502, had to replace other column ids. This is dangerous, as it also modifies dtype from f8 to f4

- supports files without setting module --> extracted loops and cycles
- handles conflict between colIDs for the "stack mode" (VMP3 hardware)
- supports old files with a timestamp with variable byte index
- added lots of new colIDs
- supports data_module version 1
- MPRfile attributes startdate, enddate, timestamp are initialized with None value because it is weird if all MPRfile objects don't have the same attributes

…ules, but only if the given argument of MPRfile is a path. This avoids keeping a file busy if an error occurred during class initialization