fix ScipyIterative.__call__() to use eps_a from configuration options
fix ScipyIterative.__call__() to use eps_a from configuration options

- update for future SciPy (1.1.x, atol argument)

vlukes/sfepy,rc/sfepy,rc/sfepy,BubuLK/sfepy,sfepy/sfepy,sfepy/sfepy,rc/sfepy,BubuLK/sfepy,vlukes/sfepy,sfepy/sfepy,vlukes/sfepy,BubuLK/sfepy