Fix order of parameters to stop_touch() in Mackie::Control

Reverse the parameters of Mackie::Control::stop_touch() to make them
consistent with AutomationControl::stop_touch(), and fix up the call to
AutomationControl::stop_touch() to have the parameters in the correct
order.

Unfortunately, I don't possess any devices that speak the Mackie protocol, so
though the patch seems logical and correct to me, I have no way of testing it.
If anyone has a device with touch faders that speaks Mackie, I'd be glad of any
confirmation that it at least doesn't break anything.
Fix build of evoral tests

Fix compile errors in libs/evoral/test/, by explicitly calling
Evoral::MusicalTime::to_double() wherever a double value is required of a
MusicalTime.

Some of the double variables should probably really be made into MusicalTime
ones instead, but I don't want to mess with this too much.

takeFiveTest still fails for me after this, but a failing test is probably
more informative in the long run than a test that won't even compile.
Add test for Evoral::coverage()

Add a test function to test Evoral::coverage() with all possible overlap
types. The first test (line 161) that expects OverlapExternal will fail
with the current implementation of coverage().

There's possibly still a discussion to be had about what the overlap type of
ranges with negative lengths should be: there are currently places in the main
Ardour code base where coverage() is called with ranges where start > end.