[ptx] about smrtblend...

[Luca N Vascon]

I tried it intensively.
It seems to give very good results, it wins here and there in comparision to 
enblend:
Where?
speed.
Overlapping with parallax error
Very little overlapping areas.
Still the issue of the 0-360 line that is not nice...
What in the hell is the code it uses???
I stitched 15K x6K pixel mosaics with no problem.
It tends to create prestitched pieces and then assemble them together...
it would be nice if  it was GNU.