include logfile.flush() but make it a configurable option

[scott2b]

Flushing data after writing to the logfile will make the logging more robust, however this will cause the Adalogger to draw a log more power, maybe about 3x as much on average (30mA avg rather than about 10mA) thus make this configurable

create a LOGFLUSH configuration with options: TRUE, FALSE (default)

put logfile.flush(); right after logfile.print which flushes only if LOGFLUSH is configured TRUE