Calculate the position of the minutiae in float(), and make the conversion to int() only at the end (avoir the misplacement because of rouding)

Rename the NIST object in the doctester from 'n' to 'mark', to be more explicit regarding the data contained in the NIST object

Monkey-patch to the LEN field problem. Not congruent with the NIST standard regarding the leading zeros. A solution will be implemented in the next release.

If the string does not contain any of the special caracters (FS, GS, RS and US), then it's a URI path. If the file does not exists, the function read() will raise a IOError Exception