sal: Threshold, blur and average with mean. Unused.

The idea is to "spread out" salient pixels.
Currently unused though.
sal: Write results to file if second arg is given.
sal: Further refine distance stuff.
sal: Factorize into a standalone function.

Now usable externally such as in cd.
sal: Some more stuff.
sal: Fix attendance algorithm.
sal: Iterate attendance threshold 10x.

Also normalize initial saliency.
sal: Update shellscript.
roc: Tools for ROC analysis.
tile: Combine result images.
pyr: Add algos for FTSRD and multi-scale contrast.
roc: Update test code.