Log Message:
math/R-DBI: Update to 0.8

Notable changes since 0.7.0:

    - SQL() now strips the names from the output if the names argument is
      unset.

    - The dbReadTable(), dbWriteTable(), dbExistsTable(), dbRemoveTable(),
      and dbListFields() generics now specialize over the first two
      arguments to support implementations with the Id S4 class as type
      for the second argument. Some packages may need to update their
      documentation to satisfy R CMD check again.

    - Schema support: Export Id(), new generics dbListObjects() and
      dbUnquoteIdentifier(), methods for Id that call dbQuoteIdentifier()
      and then forward.

    - New dbQuoteLiteral() generic. The default implementation uses
      switchpatch to avoid dispatch ambiguities, and forwards to
      dbQuoteString() for character vectors. Backends may override methods
      that also dispatch on the second argument, but in this case also an
      override for the "SQL" class is necessary.