chlamydia building -devel isos again

["Simon 'corecode' Schubert" <corecode@xxxxxxxxxxxx>]

FYI

my recent changes to nrelease enabled chlamydia (running -release) to 
build -devel and -preview isos again.

furthermore, if iso creation itself fails, but everything until 
buildkernel worked, at least the kernel will be available.

furthermore i'm serving src snapshots for all those who want to fetch 
the initial src rather as .tar.gz than via cvsup.  a working 
buildworld/buildkernel leads to an updated src snapshot.  these 
snapshots contain sup/ as well to speed up later cvsupping.

cheers
  simon

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