docs: add debugging section to installation.rst
docs: add debugging section to installation.rst

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