Split `DBMut` into `DBMutBase` and `DBMutMore`

[KyGost]

Maybe better names needed.

DBMutBase should have very simple mutability.
Maybe just insert data and insert table?

[KyGost]

DBMutMore could have derivitave defaults, for example, update could be delete and insert by default.

For this to be the case-- perhaps base should have:

• insert table
• delete table (implies delete data too)
• insert rows

More could derive:

• truncate table
  • select table
  • delete table
  • insert table
• update rows
  • select rows
  • truncate table
  • insert rows
• alter table
  • select rows
  • delete table
  • insert table
  • insert rows

(Leaving no functions underived?... Great!)