Update admin/gentoo/puse

Handle SLOT specifier at the end of package names
Update to Tcl scripts tcl/qutils, misc/ungarble, admin/gentoo/puse

* Change behaviour of ::qutils::lremove to operate on a list instead of
  a list variable
* Favour try{} constructs instead of if{[catch]} constructs
Update admin/gentoo/puse

* Add support for ?? query to query all flags
* Rework handling of multiple queries: queries now display on
  individual lines
* Disable sorting of queries before displaying them (to let the queries
  appear in the order they were on the command line)
* Print the queries before trying to write to the file (so that query
  results are displayed even if writing to the file fails)
* Improve the flag update mechanism (sort the flags and remove
  duplicates)