New software support and UrJTAG bug fix

openFPGALoader now supports Bus Blaster.
IOt can be used for both JTAG access (cable type bus_blaster), or accessing the internal JTAG chain on which the XC2C32A is connected (cable type bus_blaster_b).
Unfortunately, openFPGAloader doesn't know yet how to program the XC2C32A itself, only detect it on the chain.
Please see https://github.com/trabucayre/openFPGALoader/commit/8f60c52df64606f1ec84954cd5d69635680ca29a

Also fixed a UrJTAG bug that caused it to stop working once openFPGAloader was run.
Please see https://sourceforge.net/p/urjtag/git/ci/ae2cacceab95c9c871a0583eeded414530c1b119/