Remove installed

[Christian-B]

This is an extra check of the install

It also avoid duplicate aplx files to finds

All files that should have been copied to site packages by the install are removed.

All c code that should have been built is removed

PDP2 is not removed due to:
SpiNNakerManchester/SpiNNaker_PDP2#71

This exposed various small issues which are fixed below:
These are all independent and can be merged before this one:

Problems included:

test cfg checker which was using up and down to find cfg files are than package import

Not installing aplx files that the need to be built. Build first then install them

board_test_configuration.py and the cfg it uses being outside of the spinnman package yet used inside

• The cfg includes some Machine options which have been moved to spinnman.cfg

spinnaker_testbase/test_no_job_destroy has to be run as a module as it is now only in site_packages