Resolves #181 : multiscale implemented for initial registration in spam-ldic and spam-ddic (-regb -> -regbb to -regbe) as well as multiscale for the labels in spam-ddic (-lcmsb)

merging ddic-debug -- there is now a debug mode for ddic, its correlation is by default rigid, and there is a new spam-ereg-discrete that helps align label manually

new ddic script: lc options instead of gp; gradient update; debug mode; applyPhi nicely for pixel search

The gradient can be updated in the grain registration inside ddic. Before the pixelSearch, F is applied for better results. The output of pixelSearch is checked for nan

This reverts commit a3f6636e.