[Cin] two patches for vframe.C and trackcanvas.C

[Andrew Randrianasulu]

I used cppcheck 2.7.4 on cingg sources again and it spotted uninitialized
variable in trackcanvas.C

I hope I fixed it right.

also I copy/pasted

https://github.com/vanakala/cinelerra-cve/commit/167b63df12cc4106359645d1752e0f2136ec7a7f

"Align VFrame rows to 16 byte boundary
Should make video transformations more cpu cache friendly"

it compiles and runs - can anyone check performance impact?
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