new sfepy/base/resolve_deps.py - functions for resolving dependencies
new sfepy/base/resolve_deps.py - functions for resolving dependencies

- new get_nums(), solvable(), remove_known(), try_block(), resolve()

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