working, but all server tests are failing because history is not
supported by DOOCS yet.

This branch has to be postponed until it is supported by DOOCS.

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

 - Introduce a new D_xy tag which takes x_source and y_source
 - The two sources are attached to a DataConsistentcyGroup. Only If the
   consistency group signalizes a consistent state, the data is updated

The change in test application causes FROM_DEVICE values to be written
only if the TO_DEVICE variables are modified.

Fixes #21

Fixes #21

It basically decorated the AutoPropertyDescription with the type which
is now in AutpPropertyDescription

Helps debugging a bit