begin ECDSA
maybe ecdsa
small changes
num_gmp.h and begin tests
fix tests
some comments and more loops in test
more tests
bugfix FieldElem::SetHex
minimal
bugfixes and num-based Field::Inverse
maybe testable
add header
validation bugfixes: validates main bitcoin chain
num_openssl.h bugfixes
simple makefile
remove Context interface... it doesn't help much
Split field def/impl
Split headers/code
add signing