Add New Package:PSCMC

[Bitllion]

No description provided.

[spackbot-app]

Hi @Bitllion! I noticed that the following package(s) don't yet have maintainers:

• pscmc

Are you interested in adopting any of these package(s)? If so, simply add the following to the package class:

    maintainers = ['Bitllion']

If not, could you contact the developers of this package and see if they are interested? You can quickly see who has worked on a package with spack blame:

$ spack blame pscmc

Thank you for your help! Please don't add maintainers without their consent.

You don't have to be a Spack expert or package developer in order to be a "maintainer," it just gives us a list of users willing to review PRs or debug issues relating to this package. A package can have multiple maintainers; just add a list of GitHub handles of anyone who wants to volunteer.

[spackbot-app]

@Bitllion can you review this PR?

This PR modifies the following package(s), for which you are listed as a maintainer:

• abacus

[tldahlgren]

Did you intend to include the abacus package here? These changes are already in #30933

[Bitllion]

Did you intend to include the abacus package here? These changes are already in #30933

Sorry,This is a misunderstanding.
I found a spack stytle errorr on abacus,
Reference to previous version：
from spack import *
I don't know when it was changed to this：
from spack.package import *
Now I have corrected the style error of the abacus branch, but the development branch is still wrong. Because the PSCM branch is just checked out from the development branch, it affects my pscmc branch

[tldahlgren]

Please correct the ending copyright year.