object.h

Saved 8 bytes per object (for objects that do not use their parent scope),
fixed some memory leaks and
first implementation of constant objects (Gmp.Bignum, Math.Matrix and Image.Colour)

Rev: src/backend.cmod:1.14
Rev: src/builtin.cmod:1.27
Rev: src/builtin_functions.c:1.362
Rev: src/docode.c:1.111
Rev: src/encode.c:1.98
Rev: src/gc.c:1.149
Rev: src/interpret.c:1.191
Rev: src/las.c:1.251
Rev: src/main.c:1.123
Rev: src/modules/Gmp/mpz_glue.c:1.93
Rev: src/modules/Image/colors.c:1.49
Rev: src/modules/Math/math_matrix.c:1.22
Rev: src/modules/Oracle/oracle.c:1.56
Rev: src/modules/files/socket.c:1.54
Rev: src/object.c:1.169
Rev: src/object.h:1.62
Rev: src/program.c:1.314
Rev: src/program.h:1.125
Rev: src/threads.h:1.114
Rev: src/version.h:1.273