Use a clearer error message when a second ZOS instance is initialized #24
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Currently, when a second instance of
zospy.ZOS
is created, an exception is thrown which states that only a single instance ofZOS
can be initialized. The message doesn't state why the number of instances is limited to one, and why the exception is raised. As seen in #19, this can be confusing.I updated the error message to include more information about the reason of this limitation and why the exception was thrown.