Warn and relax global j1939 if non-extended IDs present

[hacklint]

I had a DBC file containing one message with non-extended ID.
asammdf refused to accept that and threw an exception even if the rest of the file was OK.
I think warning in this case may be a less drastic approach - the suggested change allows me
to run without modifying either asammdf locally or my incoming data, while still passing the tests.

Speaking of tests - it seems to me that running the GUI tests on a large screen (3840 x 2160)
places the gui window in the lower right part of the screen, but it seems the cursor is placed farther
and farther to "north-west", ie up and left - and after a while leaving the window which stops the
test sequence. Manually moving it back makes tests continue, but the behaviour is repeated,
Running on a "standard" sized screen does not seem to behave like this.