random walk test: fixed: the change axioms should be re-initialized in
the beginning of every round; introduced a test for checking the final
change in the non-incremental way - fails now for several inputs; fixed
the seed (was constant before) 
trying to fix several problem related to re-using
of non-incremental reasoner: index reset is now removed as it works
incorrectly with cached owl:Thing, owl:Nothing outside of the index.
Will need to make a test. Added a few more logging messages
Merge branch 'elk-new-incremental' of https://github.com/klinovp/elk.git into elk-new-incremental