Remove requirement for zlibtcl if running in 8.6
Removing the requirement for Trf to do zipfile::encode/decode in tcl 8.6+. Those
functions are now built into Tcl after 8.6
New implementation of zipfile::encode for 8.6

Tweaked the native 8.6 decode to use the correct compression algorithm
Typo Fix
Final tweaks
Trying to clamp down on why Unix can build zipfiles, but Windows can't
Merging with Trunk
Merging in changes from trunk

Maked the variables exposde by ftpd a little less generic
Adding nettool to odie, bringing odie branch up to the latest trunk
Added the odie package to nettool. (Probably not staying around in it's current form, but at the very least aku can peer into the madness a bit further)
Added the codebale module and shuffled a few sub-packages into the odie directory.

Corrected some deficiencies with the "cron" package, and added documentation and tests.
Added documentation for the cron::at command
Eliminated all external dependencies on nettool. (Or at least restricted those depenedencies to
other well defined packages in Tcllib)

Adapted the file structure for nettool to play nicer with others. The files of the 
platform/ file system have been moved to the root of nettool, and given _
delimted file names.

Moved cron to it's own module
Merging branch in preparation for closing it