Shouldn't be possible for log file to crash system

Currently if the log file grows (perhaps through some error) to fill the flash drive, the webgui becomes unresponsive, IMHO, this is a bug.

Normally, the way this is handed is by a line in the log file that says something like >XXX lines similar to ZZZZ rather than expanding to fill all available size, alternatively, truncating part of the log file.