Fix `assert_complete' to expect the longest common prefix to be presented as completion.
When trying to do a:
package require textutil::string
it appeared DejaGnu overwrites `unknown', the tcl function that is called to attempt autoloading. A workaround is used for tcl auto-loading to work: `init.tcl' is reloaded to restore the original `unknown' function:
source [file join [info library] init.tcl]
See also: http://fvue.nl/wiki/DejaGnu:_proc_"tclPkgUnknown_..."_does_not_exist