opendingux: Make init script S01checkroot.sh executable
opendingux: Don't launch local scripts from rcS

The local directory is only guaranteed to be available starting from
S15localfsinit.sh; so the rcS script will not find any local script as
it executes first.
opendingux: Added init script S16localscripts.sh

This init script can be used to start or stop all the scripts located
in /usr/local/etc/init.d.