Further updates and bug fixes

• Fixed AnalogManager::SerialReadOut() for photodiodes and thermistors
• Switched to using wget in DataAcquisition::FtpPoll()
• Update DataAcquisition::ProcessIncomingData() to handle unexpected files properly
• Streamlined readout through AnalogManager
• Fixed bug in AnalogManager::WriteThermPkt()
• Add info on configurable parameters to the docs
• Make instrument mode switching more robust
• Add camera selection to configuration file