Jean-Marc Lasgouttes 0a65e96ed3 Improvements to lyx sweave support
- use a null device to avoid the extra Rplots.pdf file created by Sweave
- use directly setwd() instead of in the preamble of the module
- add lots of comments.

This finally fixes ticket #6623.


git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@38359 a592a061-630c-0410-9148-cb99ea01b6c8
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