- move documentation to the `describe-mode' section
- implement TLC command line options: for each TLC
config file, there might be a .cfgtlcopt file that
contains an association list for controlling the
parameters when running the TLC model checker.
- add tla+/read-options, tla+/write-options and
tla+/add-option to manipulate the option
- extend the widget to allow selecting various
options.
- use the TLA+ mode for the .cfg file as well; insert
a local variable block for selecting the appropriate
emacs mode.