fix bugs in OpenLog.ino

[biomurph]

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Changes to make this sketch work with latest library dependencies.

As per the OpenLog Hookup Guide, the firmware running on OpenLog (OpenLog.ino) requires the use of Bill Greiman's SdFat-beta and SerialPort.

Using the latest versions of those libraries, the OpenLog.ino contains bugs that I have squashed in this pull request. Bugs are based in the SdFat library usage. I have NOT tried or tested the other OpenLog Firmware sketches.

Also, I added a feature! When you are in COMMAND_MODE you can send OpenLog a '#' and it will send back the current file number, terminated with a '\n'. You're welcome!

[nseidle]

Thanks @biomurph! The changes look pretty good. I'll have time to test it out soon.