type handling bugs fixed (function/program)

Rev: src/ChangeLog:1.84
Rev: src/interpret.c:1.29
Rev: src/lex.c:1.16
Rev: src/opcodes.c:1.4
Rev: src/opcodes.h:1.2
Rev: src/operators.c:1.10
Rev: src/pike_types.c:1.18
Rev: src/testsuite.in:1.33