move plotting-related imports in log.py into ProcessPlotter and Log
move plotting-related imports in log.py into ProcessPlotter and Log

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