#12: clear locals at vm init

Some systems do not bzero the stack memory.
Fixes some errors found with valgrind and AddressSanitizer
settuple, i.e. test/classes/monkey.pn works now
issue #15: fix config deps config.inc -> core/config.h

changing config.inc now transports the changes over to config.h
cmdline make XX= overrides also, but are not stored in config.inc
this is okay