Replaced IS_ZERO with SAFE_IS_ZERO, except where it's obvious that UNSAFE_IS_ZERO works. Rev: src/array.c:1.121 Rev: src/builtin.cmod:1.72 Rev: src/builtin_functions.c:1.418 Rev: src/cpp.c:1.96 Rev: src/encode.c:1.135 Rev: src/interpret.c:1.254 Rev: src/interpret_functions.h:1.98 Rev: src/iterators.cmod:1.17 Rev: src/language.yacc:1.267 Rev: src/las.c:1.277 Rev: src/module_support.c:1.42 Rev: src/modules/Image/encodings/_xpm.c:1.18 Rev: src/modules/Image/encodings/ilbm.c:1.23 Rev: src/modules/Image/encodings/png.c:1.43 Rev: src/modules/Image/encodings/pvr.c:1.16 Rev: src/modules/Image/encodings/ras.c:1.15 Rev: src/modules/Image/encodings/xbm.c:1.15 Rev: src/modules/Parser/html.c:1.148 Rev: src/modules/_Image_GIF/image_gif.c:1.8 Rev: src/modules/files/efuns.c:1.107 Rev: src/modules/files/file.c:1.230 Rev: src/modules/files/socket.c:1.57 Rev: src/modules/files/stat.c:1.19 Rev: src/modules/files/udp.c:1.28 Rev: src/modules/spider/xml.c:1.47 Rev: src/modules/sprintf/sprintf.c:1.86 Rev: src/multiset.c:1.45 Rev: src/opcodes.c:1.118 Rev: src/operators.c:1.144 Rev: src/post_modules/GTK/source/gtkclist.pre:1.13 Rev: src/preprocessor.h:1.48 Rev: src/program.c:1.392 Rev: src/signal_handler.c:1.212 Rev: src/threads.c:1.177