- document urjtag build (jtag in Ubuntu 16.04 is broken)
- add environment sanity wrappers for acroread,awk,firefox to ensure
proper operation of vivado under Ubuntu 16.04
- after 0.581: documentation updates, no functional changes
- from 0.5 -> 0.6:
- revised ibus and rbus protocol; backend server rewritten; Nexys3 port;
Cypress Fx2 support; LP11,PC11 support