Add `overwrite` arg to `downloadModule` & `downloadData` about spades.core HOT 8 CLOSED

Thanks @CeresBarros! The overwrite arg is passed to write_disk inside the GET call; see the example Eliot used in the first message in this thread. It sounds like you used it correctly. I'll review the PR later tonight.

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NOTE: download.file already overwrites by default

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presumably a FALSE is also relevant, thus the need for argument

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from spades.core.

I've added an overwrite option to downloadModule and opened a PR. There seem to be two minor conflicts (which I think I solved?) on the .R and .Rd files for downloadModules.
I've also tried to clarify the documentation of getModuleVersion, as I felt it wasn't clear where the version was being extracted from.

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Also, in response to Alex's last comment: are you sure the overwrite option can be passed to GET? I've passed if to write_disk in downloadModule, because I couldn't find an overwrite option in GET.

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@CeresBarros did you also add it to downoladData?

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Nop, but if overwrite passes from GET to write_disk I'll do it :)

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