more debug,

more optimizations,
new efuns: int2char, basetype
new opcodes: F_CALL_BUILTIN1, F_CALL_BUILTIN1_AND_POP, F_BRANCH_IF_TYPE_IS_NOT

Rev: src/builtin.cmod:1.53
Rev: src/builtin_functions.c:1.388
Rev: src/constants.c:1.31
Rev: src/constants.h:1.18
Rev: src/docode.c:1.124
Rev: src/interpret.c:1.211
Rev: src/interpret_functions.h:1.66
Rev: src/lex.c:1.91
Rev: src/modules/sprintf/sprintf.c:1.79
Rev: src/peep.c:1.49
Rev: src/peep.in:1.56