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EtherCAT master TODO

$Id$

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Version 1.5.0:

* Remove ecrt_domain_state().
* Segmented Sdo downloads.
* Overthink pointer return values.

Future issues:

* Distributed clocks.
* Move master threads, slave handlers and state machines into a user
  space daemon.
* Allow master requesting when in ORPHANED phase
* Mailbox protocol handlers.
* Mailbox state machine using toggle bits.
* Mailbox gateway.
* Separate CoE debugging.
* Evaluate EEPROM contents after writing.
* Optimize alignment of process data.
* Redundancy with 2 network adapters.
* Interface/buffers for asynchronous domain IO.
* Make scanning and configuration run parallel (each).
* File access over EtherCAT (FoE).
* ethercat tool:
    - Data type abbreviations.
    - Add a -n (numeric) switch.
	- Check for unwanted options.
* Simplyfy master fsm by introducing a common request state to handle external
  requests (replace write_sii, sdo_request, etc).

Smaller issues:

* Stop master thread at ecrt_master_request() to get rid of allow_* flags?
* Clear sync managers in INIT.
* Read out CRC counters.
* Configure slave ports to automatically open on link detection.
* Only execute one EoE handler per EoE cycle.
* Fix datagram errors on application loading/unloading.

Less important issues:

* Allow VLAN tagging.
* Determine number of frames, the NIC can handle.

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