karma for lyxdoc

[Angus Leeming]

Tomasz Luczak has posted a new pl_Extended.lyx to me (by way of Michael!). I 
don't have karma for lyxdoc so have put it on
        http://www.devel.lyx.org:~leeming/pl_Extended.lyx.bz2
It's 72kB. Could someone with karma please commit it?

Angus