sw: Small changes in PTS build system and additions to flash test
Mainly, the build system changes consist in organizing the makefile better and building to a local `ubuntu/' folder, which should then be copied directly to the PTS system. Then, the flash test changes consist in checking for a BusException error to not fall in the trap of continuing on other exceptions occuring in the block of code under `try'. Also, the flash test is more "modular" in that the gateware versions to be downloaded can be specified at the beginning of the file.
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