X9ECParameters extends ECDomainParameters class

The X9ECParameters is extension on top of ECDomainParameters.
Previously this wasn't clear.
ECNamedCurveTable infrastructure and users

First iteration of ECNamedCurveTable infrastructure calling all
instances of named curve registries, and all applications using
this instead of repeating same code all over the place -- with
slight variations in call order..
Merge branch 'master' of github.com:oh2mqk/bc-java
Merge remote-tracking branch 'origin/master'