Moved config_secn to S19 ahead of network in startup
Modified checkip.js to allow TX-Power 0-20
Update device specific files for all devices to match base files for WAN  and DHCP/DNS updates
Updated checkip.js to support TxPower 0 - 20dBm
Updated build scripts to delete SECN-build folder completely before getting Git repo files to avoid any leftover files.
Merge pull request #6 from tgillett/Fix-1f

Fix 1f