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Fix coding style #178
The Travis-CI build fails for coding style reasons (first occurence quickly found is build #278). Some modules import unnecessary symbols.
Fix coding style according to PEP8. Remove unused imports except for those explicitly marked as voluntary.
Changes to make the CI build work are trivial and in principle harmless. Removal of unused imports may break client code (that shouldn't be) relying on them. Didn't check thoroughly for module import side effects within the