TODO list:

* Use zippo. 
* Use zippo. 
* Use libzippo.
* Write Turbo Vision controls: scrollable checkbox list and package info pane.
* Set PATH=... and set DJGPP=... in autoexec.bat must be before calling
  NC, DN, win 3.1, etc...
* Optionally add TMPDIR enviroment variable
* Provide way to create additional batch file which sets DJGPP and adjusts
PATH. This will remove need for reboot.
* Add xfoo() wrappers for most C library foo() functions which do error 
checking and aborting nicely.
