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

RS485 test: checking input counters for all-zeroes and outputting a message if
true.

Makefile: Updated link to binary

Added the repetitive stuff for the pulse test itself to a function that gets
called with the necessary parameters. Then, some small changes were made to the
pulse test (like clearing the counters before enabling the pulse repetition) to
make the pulse test work.

It now almost works, but we're still not there yet, to be determined if this is
a hardware issue or still script problems (most likely the former).

The pulse test should also have better output (like tell on ERROR on which phase
it fails)

The main additions consist in checking for (and exiting on) wrong RTM detection
line readout, which indicates either a missing RTM, or that the Schmitt trigger
is a dud.

Then, the script also exits when the response of the PTS user to the questions
about the connections is a "no".

These two changes are both done to not waste time and energy on performing tests
on fundamentally wrong test conditions.

Finally, the pulses are enabled when performing fail-safe tests (MUX sel lines
"11"), since otherwise the test would pass without giving any useful information
on this test, as the HDL behaves in the same way if the RS-485 xceivers are
disabled or if they are in fail-safe.

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.

This commit:
- adds rs485_pulse.py test script
- adds corresponding bits in ptsdefine.py
- adds the test in the Makefile