Undistributed packages that don't load

[d-torrance]

Originally posted by @mahrud in #3419 (comment):

If the undistributed packages don't load, what's the point of keeping them?

I investigated each of the undistributed packages that fail to load so we'd have a starting point for discussion about what to do with them:

• CodepthThree: Raises an error saying that it has been renamed to TorAlgebra.
• CustomEngineTests: Raises an error saying that it has been deprecated.
• FastLinearAlgebra: Raises an error saying that it has been deprecated.
• FrobeniusMultiplicities: Mutable unexported symbol (k on line 179), and tensorF is documented twice.
• MemoryLeaks: No call to newPackage
• Mysql: Doesn't export MysqlResult (or MysqlField) from Core, so we get an error trying to assign a synonym on line 18.
• ParameterSchemes: Lots of mutable unexported symbols.
• Polyhedra2: Loads PolyhedralObjects (see below).
• PolyhedralObjects: Empty Exampleentries in documentation.
• RisaAsir: Empty Example entry in documentation.
• Sage: See #1022.
• SecondPackage: Authors option is malformed.
• ToricCohomology: Lots of mutable unexported symbols.