Adding an example of parallel small groups search

[olexandr-konovalov]

As the first Software Carpentry workshop that included GAP lesson was part of the largee event (http://www.codima.ac.uk/school2015/), this was covered by subsequent program that week. But the small groups search would fit very well into the SCSCP master-worker skeleton, so an example of parallel small group search may be nice (and it will avoid diving into OpenMath internals, not suitable for the introductory lesson).