Add definition of create_suffix.
Add create_suffix.
Fixed find_suffix to compare length before attempting comparison of
string.
Add definition for set_mmssuffixes.
Add set_mmssuffixes.
Adjusted Build_Suffix_List to call set_mmssuffixes.
Completed changes in description file parser to cope with  new suffixes
directives; .SUFFIXES_AFTER, .SUFFIXES_BEFORE and .SUFFIXES_DELETE.
Changed Define_Symbol to allow inclusion of a separator when appending
a value.
Changes to cope with the new handling of appending to symbols values in
Define_Symbol.
Correct signedness typo.
Corrections to the way MMSTARGETS was being defined.
Fixed the definition of MMSSUFFIXES.