PEP8 branch commits. Details:

PEP8 corrections:
o line lengths (not affecting readability);
o format strings;
o unused variables;
o unused imports (chimera.core.logs...);
o Scheduler modules untouched;
o typos! ("import SocketSever", "telescoope",...)
o some deprecations (Dict.has_keys(), class/object comparisons "is" replaces ==, etc.)