Changed calls of exec_() into exec(). release-3.1.0

Created global tag <release-3.0.0>.

Removed support for Python2. release-3.0.0

Updated copyright for 2020.

Created global tag <release-2.0.4>.

bug fixes release-2.0.4

Updated copyright for 2019.

(0) -30 -10 -7 +7 +10 tip

eric ide

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