search the str-buffer1 for the text of str-buffer2,
if it is contained return TRUE and return buffer-values that
point to the contained string, otherwise return FALSE and
leave the original str-buffer1.
this word does almost the same as LITERAL - it takes
an S" string as specified in the CS-STACK at compile
time and compiles into the current definition where it is
returned as if there were a direct string-literal. This
can be used to compute a string-literal at compile-time
and hardwire it.