added command to toggle image saving, fixes issue #101
added check for setting values and updates error code
added command error code description in commandHandlerThread
modified PROC ACK command to carry a payload and added request info commands
queue_cmd_proc_ack_tmpacket used to send get command output
merge from upstream
SAS-1 forwards command packets to SAS-2
Only SAS-1 will acknowledge the receipt of external commands
Confirms that the command packet is intended for SAS before parsing it
Thread to gate command output from SAS-2 headed to CTL
Protection in case UDP listening is changed to non-blocking
Fixed SAS command keys
Fixes to command handling
Fixed and standardized naming
Fixes and improved handling of disk-usage command
Reverting missed reversion
Merging Steve's edits plus my fixes
Merge pull request #113 from ayshih/forward2

Proper network topology, plus Steve's additions