1.0.7.25: better MEMBER transform

1.0.7.25: better MEMBER transform

 * Specialized versions for different keyword combinations: %MEMBER,
   %MEMBER-TEST, %MEMBER-KEY-TEST, etc. These versions have positional
   arguments, and the callable arguments are known to be functions.

 * The transform open codes for all combinations of keywords if the
   second argument is constant and (>= SPEED SPACE). Otherwise the
   transform selects the appropriate specialized version and open
   codes %COERCE-CALLABLE-TO-FUN around keyword arguments, allowing
   type inference to optimize it away for arguments known to be
   functions.

 * Tests.