Adding attack calculation (untested)
Adding release calculation (untested) with a few extra tweaks
Cleaning up
US22: Final US commit, needs troubleshooting.
DE3: Broke calculation and writing into separate parts for memory conservation, as the attack calculation loop was using up too much memory when done at once.  Included is a fix for DE2, the number of samples was not calculated correctly.
US22: Working attack and decay (aka release).  Included are renamings to from release- to decay-, and other tweaks.
Merge US22 branch into develop.  Brings working attack and decay (release),
as well as major algorithm adjustments for memory concerns.