Merge pull request #22 from mape1991/dev_server_unit_tests

Dev server unit tests
add trilateration for position computing
add trilateration for position computing
update gui, fix test_full
update test structure but fails
merge with old unit_tests branch locally on vuhai computer
rebase from unit tests branch
tracing for test_full
set drone in test_full mode
test_full tracing
dev_server v1.04