major change from issuing one openload command to stepping through all stages one by one. Remove openload, change all requests to use new step interface. fix bug in terminate code.

fix err msg memory leak, fix destroy func bug when no file, fix destroy to return a ZMapServerResponseType

remove openserverload, add functions to allocate/destroy requests, add proper support for all requests, handle 'unsupported' requests properly.

correct a couple of func prototypes so all funcs return a ZMapServerResponseType. Fix return code from close ruotine.