Expand metalab format to accommodate longitudinal datasets

[lottiegasp]

I have been talking to @alecristia about longitudinal datasets, e.g. an early predictor of later language outcome, and adding these to MetaLab.

Alex started this other website inVarInf prior to MetaLab which is out of date, so in future she thinks it would be preferable to add meta-analyses to MetaLab rather than try to add to inVarInf.

• [ ] There is already one longitudinal dataset on MetaLab, however Alex pointed out that the MetaLab structure perhaps is not quite compatible as is for longitudinal data, i.e. it doesn't have a column for age at outcome. So a task would be to look into making these adjustments. I might try to do so since it's a topic related to my PhD, but wanted to add it here in case I don't manage and if someone else comes along and wants to!
• [ ] If we make these changes, Alex shared a meta-analysis which could be added to MetaLab which I have added to the Google Drive

[christinabergmann]

There is also an in progress dataset from colleagues here at MPI and we could look into adding meta-analyses that assess longitudinal relationships - there are now quite a few I think (we already have pointing)