Remove PTVATCode enum. Now PTTAx has a static class with the possible values
Remove PTTaxType. Add NONE taxType to TaxRateType.
Merge branch 'platypus-fix' of github.com:premium-minds/billy into platypus-fix

Conflicts:
	billy-platypus/src/main/resources/Result.pdf
	billy-platypus/src/test/resources/documents/SAFT.xml