rbus->ibus window. Replaces with a 4k word window for whole IO page.
- utilize rlink protocol version 4 features in w11a backend
- use attn notifies to dispatch attn handlers
- use larger blocks (7*512 rather 1*512 bytes) for rdma transfers
- use labo and merge csr updates with last block transfer
- this combined reduces the number of round trips by a factor 2 to 3,
and in some cases the throughput accordingly.
- C++ and Tcl based backend server: many support classes for interfacing to
w11 system designs, and the associated Tcl bindings.
- add 'asm-11', a simple, Macro-11 syntax subset combatible, assembler.
- use now doxygen 1.8.3.1, generate c++,tcl, and vhdl source docs
