many optimizations added (see Changelog)

Rev: src/builtin_functions.c:1.25
Rev: src/docode.c:1.10
Rev: src/interpret.c:1.23
Rev: src/language.yacc:1.21
Rev: src/las.c:1.16
Rev: src/lex.c:1.14
Rev: src/lex.h:1.3
Rev: src/peep.c:1.5
Rev: src/peep.in:1.3
Rev: src/pike_types.c:1.15
Rev: src/port.h:1.11