Rename PACKAGE-LOCAL-NICKNAME to ADD-PACKAGE-LO...

ADD-PACKAGE-LOCAL-NICKNAME mirrors sbcl's naming.
CCL: default to readtables with CCL reader macros

Clozure Common Lisp has a set of default reader macros; e.g. #_
references foreign functions. (LS:RT) and (SETUP-PACKAGE-RT ...) both
default to returning readtables which have those macros active.
Rename SYNONYM-SYMBOL to ADD-SYNONYM-SYMBOL
Add Symbol Package Markers

Also add a mechanism for creating custom ways to associate the package
name section of a symbol to a package.
Add RT Local Package Translations

They are an alternative to Package Local Nicknames and SPMs