Clarification of license and copyright of sqm-scripts

Make explicit that all sqm-scripts files are licensed under GPLv2.
Fix stop.sh to avoid creating spurious ifb4ge00 interfaces

stop.sh was sourcing functions.sh without IFACE being created.
In that case functions.sh was defaulting to ge00, since stop.sh was
changed to take the interface name in its first argument instead
of as an environmet variable, a spurious ifb4ge00 was created, but only
deleted if ge00 was the passed interface. For openwrt with its
ethN.N interface names that resulted in ifb4ge00 being created but
never deleted. While this probably did not cause any malfunction
it still was confusing. Hopefully it is fixed now.
Improve logging for run.sh, by including the script name (NT)
Remove dead code for handling indexed IFBs

Named IFB handling seems to work fine, while indexed IFB handling
had issues, so just deleted the indexed IFB related function.
Fix a type in simple.qos, it is differentiated not differentiad...