ec_master_sync_io(); introduced events in the master state machine;
locking of slave scanning and slave configuration through allow_scan
and allow_config flags.

examples/rtai/rtai_sample.c.

semaphore in module.c instead.

global.

ec_master_calc_addressing(), coupler_index and coupler_subindex variables.
Adapted lsec script and examples.

registration functions now take a slave pointer as argument; changed
values for ec_bus_status_t.

master array; hand ober MAC addresses with array module parameters.

machines, added datagram injection, two different master thread
functions.

ec_pdo_entry_t, respectively.

"pdo_sync".

guessing, ignoring base_sync_count.