update test_install.py to test linear_elastic_probes.py example
update test_install.py to test linear_elastic_probes.py example

vlukes/sfepy,lokik/sfepy,BubuLK/sfepy,RexFuzzle/sfepy,rc/sfepy,lokik/sfepy,sfepy/sfepy,RexFuzzle/sfepy,sfepy/sfepy,BubuLK/sfepy,RexFuzzle/sfepy,BubuLK/sfepy,lokik/sfepy,rc/sfepy,vlukes/sfepy,rc/sfepy,sfepy/sfepy,lokik/sfepy,vlukes/sfepy,RexFuzzle/sfepy