Turn on debug by default on non-release builds
Remove global_rng calls for setting up blinding, instead require a RNG
be passed to the engine. Currently pubkey.cpp just passes along the
global_rng but eventually we'll break this API and require a RNG to
the constructor.
Make Serialized_RNG public
Store all DH group info in constant memory instead of Library_State config

Remove all groups under 1024 bits

Make workfactor.h public
Same for EC groups
Move add_alias and deref_alias from Library_State to SCAN_Name
Add EC groups
Use a const reference return
Store OID info in a pair of maps in distinct storage rather than in
the library state. Remove library state config apis, as OIDS were the
last remaining user.
Split up libstate/get_enc.cpp