add bounded version of scipy's leastsq

[mmckerns]

Several users request:

• add leastsq, fmin, fmin-powel solvers with bound constraints -- additionally, add the ability to find the correlation matrix

[mmckerns]

DONE:

• scipy.fmin added around r82
• scipy.fmin_powell around r103

TODO:

• look at relative ease of adding mystic features to scipy.leastsq for mystic-0.1a1

[mmckerns]

changed summary to only reflect open work, then splintered off completed work to ticket #3

[mmckerns]

will be handled after mystic-0.1a1 release, moving ticket to mystic-dev

[altafang]

scipy.optimize's leastsq, in minpack.py, requires a fortran library: _minpack.so

[mmckerns]

numpy seems to have a leastsq, scipy has several

[mmckerns]

See these references for least-squares:

•  http://modelling3e4.connectmv.com/wiki/Software_tutorial/Least_squares_modelling_(linear_regression)
•  http://docs.scipy.org/doc/numpy/reference/generated/numpy.linalg.lstsq.html
•  http://docs.scipy.org/doc/scipy/reference/generated/scipy.optimize.leastsq.html
•  http://docs.scipy.org/doc/scipy/reference/generated/scipy.optimize.fmin_slsqp.html
•  http://docs.scipy.org/doc/scipy/reference/generated/scipy.optimize.curve_fit.html

and these additional references:

•  http://docs.scipy.org/doc/scipy/reference/tutorial/optimize.html
•  https://github.com/scipy/scipy/blob/master/scipy/optimize/optimize.py