[Kbabel] Full Gettext support in KBabel

[Chusslove Illich]

> [: Stephan Kulow :]
> We will change to standard gettext before 4.0 - if kbabel 3.5 has to be
> changed for that, be it!

This sounds like a licence for "change as needed" :)

I've added upon Nicolas' patch, making msgctxt a normal member of the 
internal data: proper support in Catalog and CatalogItem, and proper 
import and export in Gettext filter (patch_internals.diff).

I've tried to fool around with GUI, eg. make an extra tab in msgid pane, 
but it proved too much for me just by looking for analogies :) Instead, 
for debug purposes, I put msgctxt below the msgid in msgid pane, separated 
by a "Inserted by KBabel..." sort of line (patch_interface.diff). Perhaps 
it would still not be too hard to add extra GUI element for someone who 
actually knows what to do :)

-- 
Chusslove Illich (Часлав Илић)
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