This commit belongs to issue #4, allow to set the EqFct code in mapping file.
In VariableMapper a std::map with location(string) and code(int) was added.
With getLocationAndCode() this map is returned and used in eq_creat.cc to add missing locations with
10 default, or with 'code' set in the <location> tag in the mappinmg xml file.

To be reverted once DOOCS with an eq_exit method has been released

Otherwise we run into a deadlock or random crashes

Follow-up fix for 32d3728c

It seems that setting up zmq might take longer than expected. Add
additional delay and move initial write after subscription to make sure
we really receive the inital event

Fixes #13