Literal instance of data frames

[GregorySchwartz]

I assume that this feature has been discussed before, but it would be nice to have a simple conversion to and from data frames.

[qnikst]

There was an ongoing work on parser for any S-Expression, and it's easy to parse any data frames on the top. This is done in another project at the moment, but will be moved to inline-r once stabilize.

[GregorySchwartz]

I ran into an instance where JSON parsing was impossible due to the size of the string (too large for R). There should be a solution to data frame parsing.