Correct json capture

[MKLau]

JSON is not being recorded correctly.

Switching to using the jsonlite package's mechanism should correct this.

[margoseltzer]

Can we validate this with some standard PROV-JSON parser/tools?

[blernermhc]

Elizabeth is working with a validation tool on the RDataTracker side to validate against prov-json so she may have good ideas about how to incorporate the validation into provR testing.

She has also begun looking into how jsonlite works.

[MKLau]

jsonlite has a validator that checks for correct json. Implementing that world be good.

I didn't see a function in the jsonlite package to check against a standard though.

[fong22e]

I have been using the package jsonvalidate to check against a standard.