Log Message:
Update to SML/NJ 110.73

SML/NJ 110.73 provides a number of new library features,
including a new library for working with HTML 4, as well
as many bug fixes.

Details:

CM:
   + Added boolean literals (true and false) to the
     conditional-expression syntax in CM. Thus, you can write

         #if true structure Foo #endif

     in a CM file. This change is meant to make it easier to use
     autoconf to configure the build process of an SML
     application.
ML-Yacc:
   + Fixed ml-yacc examples to respect the changed signatures
     with respect to TextIO.inputLine.

SML/NJ Library:
   + Added findExe function to PathUtil module.
   + Modified the implementation of GetOpt.usageInfo so that if
     the help string has embedded newlines, then the extra lines
     are properly indented.
   + Changed the interface of JSONStreamParser to support both
     parsing files and TextIO.instreams.
   + Added HTML4 library.
   + Fixed bug in hashed cons library (bug #55).
   + Added array iterators to DynamicArray module.
Concurrent ML:
   + The paths used to specify the CML versions of libraries in
     a CM file have been rationalized (bug #68)

         $cml/basis.cm -- the CML version of $/basis.cm
         $cml/cml.cm -- core CML features
         $cml/cml-lib.cm -- CML library code
         $cml/trace-cml.cm -- TraceCML library for debugging
         $cml/smlnj-lib.cm -- CML version of the $/smlnj-lib.cm library
         $cml/inet-lib.cm -- CML version of the $/inet-lib.cm library
         $cml/unix-lib.cm -- CML version of the $/unix-lib.cm library

     Note that the old naming scheme is still supported, but may
     be removed in some future version.
   + Added Barriers module to CML.
   + Fixed the Win32 socket and polling implementation to work
     correctly with CML. Signature of poll was wrong and didn't
     handle sockets at all.
MLRISC:
   + Added support for the RTDSC and RTDSCP instructions to the
     amd64 code generator.