add openwrt firmware for wr703n and mr3040.
update fetch script to download all 3 firmware files
update tar balls following updated package fetches.
update openwrt install script so that it can work with mr3040.
Run as: 0.install-openwrt tl-mr3040
for that use.
Eventually it would be nice to auto-detect the router model.
login by telnet to set root password if required.
pull in latest version of extra files and packages