Gcs user guides

Here are some guides for various tasks within GCS

• Using autotune
• Enabling battery monitoring
• Using GCS Receiver to control UAV
• Trimming level using attitude plus
• Passing an input directly to an output
• Using the board as a USB to serial converter

And a few other helpful guides

• UBlox configuration
• Configuring MinimOSD
• Configuring an XBee