Small textual change in Copyright
Add base parameter to the diagPrint functions
One more use for sendCommand
Set pin modes for _powerPin and _ctsPin
Send FTP file data via external function (e.g. use with dataflash)
Put all possible text strings in PROGMEM

This saves about 500 data ram, and costs 150 bytes extra code space
Extend timeout of waitForSignalQuality to improve chance of connecting

For some reason it takes a loooong time to get good signal quality if
a device is connecting for the first time (in a network cell?).

Also add a few more queries, such as AT+CIMI, AT+CLIP?, AT+COLP?, AT+COPS?