grass.script: Get GISBASE automatically in get_commands #3683
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The grass.script.get_commands function requires GISBASE (more specifically, path to binary executables and scripts). The need for GISBASE prevents its use before a session (more specifically the runtime part of it) is created. This changes the function to get the GISBASE automatically when not set. It also adds the standard env parameter other functions have (which is useful mainly for tests).