Allow one to specify an ABI file via MPIPreferences#600

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sloede wants to merge 12 commits intoJuliaParallel:masterfrom

sloede:msl/allow-specifying-abi-file

Commits on May 25, 2022

Commits on May 29, 2022

Add sentence on using standard Julia alises for C types in ABI file
sloede
committed

Commits on May 31, 2022

Commits on Jun 5, 2022

Indicate custom ABI file using `abi="custom"`
sloede
committed