variables in parents now works correctly

Rev: lib/master.pike:1.43.2.3
Rev: lib/modules/Stack.pmod:1.2.2.1(DEAD)
Rev: src/ChangeLog:1.97.2.3
Rev: src/builtin_functions.c:1.36.2.2
Rev: src/builtin_functions.h:1.3.2.2
Rev: src/cpp.h:1.1.2.1
Rev: src/docode.c:1.16.2.2
Rev: src/error.c:1.6.2.1
Rev: src/gc.c:1.8.2.1
Rev: src/interpret.c:1.42.2.2
Rev: src/language.yacc:1.42.2.3
Rev: src/las.c:1.32.2.2
Rev: src/las.h:1.6.2.2
Rev: src/lex.c:1.21.2.3
Rev: src/main.c:1.21.2.2
Rev: src/object.c:1.17.2.3
Rev: src/object.h:1.9.2.3
Rev: src/program.c:1.33.2.3
Rev: src/program.h:1.14.2.3
Rev: src/svalue.c:1.12.2.2
Rev: src/testsuite.in:1.40.2.3