error in use of qsort

the files lib/sharedbook.c, lib/psy.c and lib/lsp.c use the c function qsort
with wrong argument function. The compare functions sort32a, apsort and comp
return a value not zero even if the compared values are equal. with my compiler
(watcom 11.0a) the decoder hangs in qsort called in lib/sharedbook.c. if an
extra compare is added, all is fine.