[FIX] l10n_it_partially_deductible_vat errore con iva totalmente indetraibile
[IMP] performance improvement on progress rate calculation in projects
[FIX] PEP8-compliance + better check for float numbers
[REF] rewrite epsilon of float comparison to float litteral
[FIX] avoid writing picking state if it has not changed
[FIX] Avoid "Error The taxes have different rates" with non deductible VAT and
l10n_it_partially_deductible_vat
[IMP] performance improvement on progress rate calculation in projects
[FIX] avoid writing picking state if it has not changed