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methods to be written for mvbfit and lps
documentation for the classes

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07/12/2012
Restrict performance of Nelder Mead
1. Do not allow fitting on too small lambda (set large score)
2. Shorten max iters
3. Loose convergence criteria
DONE

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07/13/2012
W matrix in GACV and BGACV have memory limit when dimension too large
This is a sparse matrix, can be modified.
