Dots in fig.path and cache.path should be allowed

[achetverikov]

Currently, dots in paths are replaced with underscore, which makes relative paths impossible. It is quite inconvenient as one cannot keep cache outside of the source folders. I usually make backup copies of source, uploading everything in a source folder to server, but I don't want to backup the cache. The absolute paths are possible option, but I don't see why relative paths should be prohibited.

[ramnathv]

I believe this change is the one responsible. Should be relatively straightforward to fix.

[yihui]

No, I'm all for relative paths, and I really want to prohibit absolute paths instead.

This is a bug introduced by #321. Sorry I did not take paths like ../ into account when fixing that problem. But I do not think cache.path should be affected.

[github-actions]

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