Adding a help command
Adding better help information to the edit command.

The edit command can now show what fields can be edited.  Some defects were found in the edit command.
Fixed people fields

The people fields (owners, cc, reporters, etc) would be set as a string, yet the format_people_list function would iterate each character of the string.
This fix changes that so the function splits via comma.  Now the user can input a comma separated list of people and it will be parsed correctly.
 Adding better help information to the change command.

 The change command can now show what fields can be altered.