* First draft of a spec for splitting off the existing VT52 escape sequences, and extending the VT52 support.
* Make the issue ID visible on GitHub.
* Added suggested mappings for the Graphics Mode character set.
* Add escape sequences for all the commands and clarify the use of the ESC < sequence when switching back to ANSI mode.
* Add details about the differing boundary rules of the VT100 CUP command and the VT52 Direct Cursor Address command.
* Specify the identifying sequence that the Identify command should return.
* Add details of the print commands.
* Add a list of keyboard sequences that are different in the VT52 mode, and make the description of the Keypad Mode commands a little clearer.
* Add a section describing the testing needed to cover the new functionality.
