SYNOPSIS
result = magstripe.bits(s [, width [, firstwidth]])
DESCRIPTION
Helper function to visualize the raw bits of magstripe data. The function converts the binary contents of s into a printable string of '0's and '1's. Optionally, it can insert a space every width digits. The final parameter will make the first inserted space appear after firstwidth digits.
RETURN VALUE
A printable string.
NOTES
This is useful for debugging applications that work on magstripe data.