changed some data structures in the compiler, this should allow for

some major code cleanups

Rev: src/builtin_functions.c:1.283
Rev: src/compilation.h:1.15
Rev: src/docode.c:1.74
Rev: src/encode.c:1.60
Rev: src/language.yacc:1.191
Rev: src/las.c:1.180
Rev: src/las.h:1.39
Rev: src/modules/Gmp/mpz_glue.c:1.78
Rev: src/modules/Parser/parser.c:1.7
Rev: src/object.c:1.127
Rev: src/object.h:1.48
Rev: src/pike_types.c:1.131
Rev: src/pike_types.h:1.39
Rev: src/program.c:1.243
Rev: src/program.h:1.92
Rev: src/threads.c:1.130