rename cpass to carppass, to match other carp* commands
Before sqlite was used, NSH would determine what daemon configs to embed
into nshrc by what files were present in /var/run/xyz.conf (assuming daemon
xyz). Now that sqlite is used, the entries in "ctl" table are used to
determine which configs to include during nshrc write time. So, instead of
deleting temporal /var/run files during -i, delete the temporal sqlite
database instead, since -i mode is intended to create a new database from
an existing nshrc file. While there, add a -c mode for running single rc
commands which doesn't try and delete anything.
simplify README, more ipv6 in MANUAL
missing break
More doc update
add hardmtu to show interface output
add hwfeatures output to 'show interface' verbose mode
NSH-specific details on tftpd, tftp-proxy