Also updated the scripts with the according names and the Makefile with the new
link to the binary file.

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.

The following changes have been made to improve test script outputs:
- add numbers of ICs to test
- change CONV-TTL-BLO for CONV-TTL-RS485 where appropriate (the former was there
  because the scripts were imported from the CONV-TTL-BLO PTS)
- TTL pulse test: clearer output, indicating the channels and the ICs to check
  in case of error