fix for #6598

trying to solve compile problems; temporarily disabled some tests for just added optimization algo's

Seems correct to me and builds fine

These codes should be included into regular builds.

Added to the tutorials the "Support Vector Machines for Non-Linearly Separable Data" contributed by Fernando Iglesias García. Corrected a mistake in the gpu-basics-similarity.rst file. 

Added Fernandos first tutorial regarding SVMs. Extended the global links (conf.py). Corrected the author names. Minor modification to the dft tutorial.