WITH-MYSQL-CONNECTION now takes a value and binds the variable *MYSQL-CONNECTION*

The major use of WITH-MYSQL-CONNECTION was command initialization.

Renamed generic function #'MYSQL-COMMAND-INIT to
generic function with *MYSQL-CONNECTION*.

The few remaining uses of the names bound by WITH-MYSQL-CONNECTION
have been replaced with the dynamically scoped variable that the macro
would have bound anyhow.

Split qmynd into qmynd and qmynd-impl. This is presently a no-op as
neither package exports anything yet, but that will change soon.

BIND-MYSQL-CONNECTION takes a value and binds the variable *MYSQL-CONNECTION*

the new WITH-MYSQL-CONNECTION takes the variable and binds it to a local name.

connections are now possible, not that you can do anything else yet.