Add ProveCaller and ActionCaller The new ProveCaller and the ParseCaller share some code which is extracted to the new ActionCaller.

Set data in caller.

also throw HetsInactiveInstance when instance nil.

handle hets error via error process.

perform hets-caller with auto-command.

return the query-hash, not its last element.

perform proposed hound-style fixes.

raise HetsInactiveInstanceError if appropriate.

add basic classes to call hets-api.