bugfixes

Rev: src/configure.in:1.170
Rev: src/modules/Gmp/testsuite.in:1.11
Rev: src/modules/Image/colortable.c:1.41
Rev: src/modules/Image/encodings/gif.c:1.37
Rev: src/modules/Image/encodings/pnm.c:1.14
Rev: src/modules/Image/encodings/x.c:1.14
Rev: src/modules/Image/encodings/xwd.c:1.3
Rev: src/modules/Image/font.c:1.33
Rev: src/modules/Yp/yp.c:1.11
Rev: src/modules/files/file.c:1.82
Rev: src/modules/readline/readlinemod.c:1.7