First attempt to allow nested ePerl commands

[Denis Barbier <nospam@thanx>]

Hi,

i committed changes tonight to allow nested ePerl commands. This is very
experimental, but if some people are interested, feel free to test it.
I do not have time to perform huge tests now, so wml-SNAP could be
unstable for some days.

Changed modules are
   des/gfont.src
   des/imgbg.src
   des/imgdot.src
   des/lowsrc.src
   des/navbar.src
   des/typography.src
   fmt/verbatim.src
   fmt/xtable.src
   std/grid.src
   std/info.src
   std/logo.src
   std/tags.src

Others will be updated ASAP.

-- 
Denis Barbier
WML Maintainer
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