Log Message:
Update tk-Tix from using http://tixlibrary.sourceforge.net/, which seems
to be stuck at version 8.2.0b1, to http://tix.sourceforge.net/, which
offers version 8.4.3, straight-forward buildable with the recently updated
tcl.

Gone is "tixwish" as a separate program, instead use tk's \ 
"wish" +
"package require Tix" instead.

For a complete set of changes, see ChangeLog in the source.  The major
changes for 8.4.0 were:

    + Complete rewrite of the build system to use TEA
    + Separation of Tix package require and Tix style usage
    + Code cleanup to use Tcl 8.4 as a base version