Change paths for figures in supplement in LyX file

[ndattani]

• If we want to submit a new version to arXiv, we'll be plagued with the problem of LyX having bad paths for each of the figures in the Supplement. The paths should just be metapostfigs/xxxx. Otherwise arXiv can't find them. I fixed these manually in the .tex generated by LyX, but so that we don't have to do this manually every time we export from LyX to TeX, it would be good to fix this in the LyX too, which means clicking on about 50 figures in LyX and removing the same text from the filepath over and over again. I've assigned Nick since I've spent about two full days getting this paper and the embeddings paper submitted to arXiv, and Szilard's LyX isn't working properly.
• The other problem with compiling the .tex file is that the \geometry definition right before the "Supplementary Material" heading, appears within a bracket after LyX -> TeX conversion, and needs to be manually moved to outside the bracket. I've tried fixing this in LyX but wasn't able to get the same beautiful formatting/spacing of the figures in the PDF output.
• previously the above 2 points were enough to get it to compile, but now there's a \begin{center} which seems to need to be moved too, and by doing that I needed to also add \centering, and change a vspace{-15mm} to \vspace{-5mm} which was unexpected, so more things can pop up whenever we change the .lyx.