Res r3 model issue #318

[dwarning]

This PR fixes #318 and by using the r3_cmc Verilog-A model is now compatible with the model used in the commercial pdk.
Attached document show very few simulation examples also for noise simulation amongst others:

sg13_res_r3_model.pdf

Because of using a Verilog-A model reorganization of directory structure was needed and adms or openvaf is needed respectively used simulator.

[melikyazici]

The rshspec parameter for rppd is not explicitly defined in the resistors_mod.lib and resistors_mod_mismatch.lib files under the rppd subcircuit model, similar to rsil and rhigh.

[dwarning]

It is not wrong because the rsh_rppd (and the others) are use and defined in cornerRES.lib.
But you are right - the rshspec parameter is not used anymore. Both line should be removed (in rsil and rhigh subct).
Would be cleaner.
Or is this subckt parameter user from symbol side under gui?
Thank you.

[hpretl]

Looking at the sheer number of changed files (incl. a change of the folder structure) this PR is hefty, but switching to the R3-CMC model is excellent to have. I think we should also merge soon, before this triggers even more complications later.

@sergeiandreyev @KrzysztofHerman What do you think? @dwarning Do you think we are ready to merge?

[sergeiandreyev]

Hi @hpretl, this PR went through internal IHP review and as I understand it is ready for merge, I'll double check tomorrow