[Fluxus] commits - interpolation order mixup

[Kassen]

>
> now it has been fixed in git. it breaks old code. vmix, vlerp, lerp and
> mlerp are changed. vlerp-tangent was not working, and it was not used by
> anything, so i removed it. also added the help texts suggested by kassen.
>
>
 Just to confirm I understand it all correctly;

Is (vlerp v1 v2 f) essentially the same thing as (vmix v1 v2 f)?
Do I also notice correctly that now the order of the input vectors for vmix
is reversed from what they were with 0 being "crossfader to the left" and 1
being "crossfader to the right"? That bit confused me in the past but I
assumed it was some sort of GL or Scheme tradition so I didn't complain
about it.

This will indeed break stuff but if I understand it all correctly this
version is much better and the broken stuff will be easy to fix.

Thanks!
Kas.
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