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specification changes

1. The specs of 'opt', `cat', `key' forms of ALET have been changed:
   From (var default test ...)
   To   (var default [test [true-substitute [false-substitute]]])
   
2. The spec of `and' form of ALET has been changed:
   From (var expr test ...)
   To   (var expr [test])

3. Now, any scheme object can be a keyword of `key' form of ALET.

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Joo ChurlSoo