pledge and unveil the scripts

drop needless mkdirs

css: simplify rule for threads vertical lines netsurf' css engine didn't handle the "> ul ul" selector correctly. rephrase it so even netsurf is happy :)

mexp: handle the body line by line

move the mid -> path code to a sub in the package

drop needless chomp

move some common code in a module

don't export the mbox this wasn't a good idea as the mbox contains sensitive data (IP addresses, hostnames and whatnot). Not good to publish on the web. Reminded by Stefan

some tweaks to the generated HTML

simplify the makefile move the logic of the export to gotmarc, where it's easier to set up the correct env. While here improve the makefile to generate the images and the copy the style only if needed.

update the README

parallelize exporting mexp is the slowest part of the pipeline. Try to speed it up by paralellizing it. this adds a `pe' scripts that sits in front on N mexp childs and dispatch threads to them, while still outputting the unchanged lines for mkindex. Unscientific testing has shown that this effectively reduces the time for a full export, even if not linearly. (4 jobs cut the time in half, 8 jobs was just barely faster)

tweak link text in footer

assert that $tid is defined

grammar and clarifications