This is mostly a simple lexical search+replace but the absence of operator< for
std::weak_ptr<T> leads to some complications, particularly with Evoral::Sequence
and ExportPortChannel.
* clean up source (whitespace)
* fix speaker 3x3 matrix iteration
* update math to go along with Ardour Cartesian -- fixes rounding errors
* fix division by zero in cross_prod()
* disable old debug output
(NB PBD::spherical_to_cartesian() returns
3.7494e-33, 6.12323e-17, 1 for azimuth 90 elevation 90 distance 1
while it should return
0.000000, 0.000000, 1 for azimuth 90 elevation 90 distance 1
IOW cos(90.0 * 2.0 * M_PI / 360.0) != 0
Cause unknown. This is currently worked around check in vec_length()
)
