general cleanup.  use expr operators like eq instead of string commands

(PoorYorick): general cleanup. use expr operators like eq instead of
string commands. (AK Notes): Version bumped to 1.6, requirement bumped
to Tcl 8.5. (AK) Updated testsuite and doc Tcl requirements. Fixed the
creative writing problem of the initialization code, present before PY
cleanup.
Merging Mime Modifications.