[TCLCORE] Dynamic mode for msgcat

[Harald O. <har...@el...>]

Current msgcat 1.4.4 does not allow to switch the locale after package
load, because the corresponding language files are not loaded.

Nevertheless, there are use cases, where dynamic language selection
makes sense: dynamic guis, web servers, server processes.

On http://wiki.tcl.tk/msgcat there is a patch implementing this feature:
::msgcat::mclocale -dynamic

Is it worth to write a TIP ?

-Harald