FORMUS3IC_LAS3 / embb

The node struct was extended so the scheduling mode can be configured on
Node initialization. Therefore the scheduling mode struct was moved from
embb_mtapi_scheduler_t.h to mtapi.h.

The scheduling mode is now another node attribute and can be set as such
on program setup.

On releasing all resources, the node waits for the completion of all
tasks which are associated to a specific action. Since we never
incremented the task counter for actions, this loop spun.

mtapi_c: fixed handling of detached tasks in conjunction with retaining queues and multi-instance tasks

mtapi_network_c: signaling of task completion is now atomic

mtapi_c: do not notify all worker threads on task start, but just the one the task was initially assigned to