Rename create_pseudonym to create_nym

First step of issue #200

Beware: changes method names in public API
Merge pull request #234 from OttoAllmendinger/pr-fix-nyms-methodnames

Rename create_pseudonym to create_nym
Remove unnecessary OTAmount.
Cleanup of dead meat.
Removed unused functions.
Renamed OTAcctList to AccountList.
Added missing virtual for dtor.
Removed unecessary using.
Rearranged members.
Random cleanup of dead stuff.
Adjusted formatting.