OT_ME: merge called function into make_sure_enough_trans_nums()
OT_ME: merge called function into register_nym()
Merge pull request #489 from toxeus/apiMerge

OT_ME: merge called function into make_sure_enough_trans_nums()
opentxs: create C API in own file
C_API: add OTAPI_Exec object
C_API: ot_made_easy_ot *mustn't* be used