Can't read new TAQ files

[davclark]

Working with EQY_US_ALL_BBO_20150731.zip results in BaseException("Can't map fields onto bytes_per_line")

[davclark]

Files from 2014 have lines like this:

040000901PA               000000000000000000000000000000000000R    PP000000000000001422 C

While files from 2015 have lines like this (you may need to scroll to the side):

040000019000PA               000000000000000000000004412000000001R    PP000000000000000412 C       000000000000        000000000000

We need to find the spec for the new format. I'm going to say this is not worth doing until someone is actually using this code! It should be pretty easy to implement, though the logic will have to change in BytesSpec.check_present_fields()