Now handles "matched points" method for component offsets; Some var processing optimizations around IUP etc.
Now handles "matched points" method for component offsets; Some var processing optimizations around IUP etc.

* SamsaGlyph.prototype.decompose() now handles "matched points" method of offset components, as well as the usual dx,dy method. Tested well on VaryAlongQuad.ttf from @bungeman.
* Several minor improvements to gvar processing including avoiding a pass through all points if IUP is inactive (detected by use of the "allPoints" tvt flag)

Lorp/samsa,Lorp/samsa