Scaling

Possibility to use scale factor(s) is undoubtedly a "MUST HAVE" feature for any advisable optimization solver or framework.

Since now scaling is available in OO (update from svn or tarball is required), and example of scale factor usage (p.scale, "scaleFactor" is too long to type) has been committed to OO Doc page.

Note that using of p.diffInt as vector is also allowed.
However, using scale is more preferred: it affects xtol for those solvers who use native OO stop criteria (ralg, lincher, nssolve, nsmm, mb some else).