Add missing stanc3 supported functions

[rok-cesnovar]

There are a couple of Stan Math functions that are supported in the old Stan compiler but not in stanc3. These were all added in May and July of 2019.

gp_dot_prod_cov
gp_exp_quad_cov
gp_exponential_cov
gp_matern52_cov
gp_matern32_cov
gp_periodic_cov
add_diag

Also linking PRs that added these functions to Stan stan-dev/stan#2758 and stan-dev/stan#2779

These PRs also have test models that can be used.

[rok-cesnovar]

Cant assign myself so just stating for the record that I am working on this and will make a PR soon-ish.

[bob-carpenter]

Thanks. I assigned you.

Are you sure you can't assign yourself? I can assign myself to issues.

[rok-cesnovar]

I am now able to do that. Not sure if something changed or I was confused before. Anyhow, thanks!

[seantalts]

I had to add you to the collaborators list. And thanks for taking this on!

…

On Fri, Nov 29, 2019 at 05:08 Rok Češnovar ***@***.***> wrote: I am now able to do that. Not sure if something changed or I was confused before. Anyhow, thanks! — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#392?email_source=notifications&email_token=AAGET3AEDCXBGIMNSVJIY4DQWDSYJA5CNFSM4JSKNAVKYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOEFOOGLQ#issuecomment-559735598>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAGET3GSMT42RETZEMHNAPDQWDSYJANCNFSM4JSKNAVA> .

[rok-cesnovar]

Does closing this also close #14 ?