Extracting and saving corrupted lines in the data section

[castelao]

@OlyDLG raised some good points at #12, and we should extract and save corrupted lines, like blank lines and incomplete lines. This is different than #32 , since with the header information we know what to expect, all data lines should have the exact same structure.

One idea is to save those lines into a dictionary, and include this dictionary in the header of the cnv file, i.e. the parsed object. It the case of a line partially corrupted, it would be possible to load some columns, but there are risks on that.