CO7WT v1.4

This is a maintenance release, so far this are the changes made:

• Update to catch up with the features added in the Raduino v1.17.1 from Allard's code (CW SPOT and bug fixes)
• Upgraded the operations instructions.
  • More user friendly version with embedded images.
  • Add instructions for the S-meter, AGC and TX-power mods details and tricks.
  • Moved all images to its own folder "images".

There is a inoffensive bug in the calibrate process, in which the actual calibrate value is not correctly showed in the LCD until you move the pot to adjust it, I'm working on it.