bugzilla: localise all MySQL direct access inside access class.
Prepare for the addition of other Bugzilla access methods by localising
direct MySQL database access inside an access class.
Provide a base access class largely to document the methods required for
a class implementing a particular access method.
Rename the 'bugzilla_<version>' classes to 'bzmysql_<version>' to
emphasise that they are doing access via direct manipulation of a
MySQL database.
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