"keep_existing" flag on Table - "extend_existing" will deprecate 'useexisting'

Table("foo", metadata, 
x, y, z, UniqueConstraint(...),
keep_existing=True)

uses the existing table "foo" and ignores all arguments. This prevents redundant constraints, sequences, etc. going forward this is probably what people want instead of 'useexisting'.

the deprecation message should read "superceded by 'keep_existing' and 'extend_existing'".

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