• Moved addition of DESTROY symbol table entry in newPackage into
  code guarded by check for PREFIXED package name
  
• Created $parent_DESTROY search code that looks for DESTROYs that
  aren't clones of C::P::DESTROY
  
• Modified destroy and DESTROY so that parent slots aren't deleted
  until the destruction sequence on an object is complete
  
• Updated destroy.t to include parent** slots, more explicit scope
  ordering (which fixed test variations related to changes in the
  order in which lexicals exit scope), as well as use of field slots
  
• Added more tests to super.t
  
• Code passes all tests under:
  ActivePerl 804 (based on v5.8.0)
  ActivePerl 633 (based on v5.6.1)
  ActivePerl 517 (based on v5.005_03)
  
• Incremented version number to 0.90 to reflect code maturity level