Add more standard curves

Definitions of standard curves m163(PB) and m431(PB) added.
Param `raw` added to Point and Field constructors that truncates
coordinates instead of performing MOD operation.

Tests are added from official spec [0] examples section

[0] http://dstszi.kmu.gov.ua/dstszi/control/uk/publish/article?showHidden=1&art_id=90096&cat_id=38837