core: Make cog_modules_add_directory() honor COG_MODULEDIR #659
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Move handling of the
COG_MODULEDIR
environment variable into thecog_modules_add_directory()
function, fix the bug that skipped using the environment variable whencog_init()
is not used, and improve robustness:NULL
argument.While at it, sprinkle comments on the code to explain the logic.
This depends on changes from #655