new smooth functions

[vtvivian]

tested on mtex6.2.beta.3 mtexdata twins

mtexdata twins
grains = calcGrains(ebsd('indexed'))
figure; nextAxis; plot(grains,grains.id); mtexColorMap lines;
%%
grains2 = boundaryContours(grains)
nextAxis; plot(grains2,grains2.id); mtexColorMap lines;
%%
[grains3,stableFrac] = smooth(grains2,1000,ebsd)
nextAxis; plot(grains3,grains3.id); mtexColorMap lines;