- Add initial support for pocolibs posters

Fix DEPEND_DIR.py-poco, causing errors in show-depends of wip/hri-simulation,
and fix a typo in the pkgname (s/pypoco/py-poco/).

While here, generate headings, disable configure step, and print-PLIST.

I'd suggest that the package is renamed to py-tclserv, as this is what it
really does (at least it does not do any pocolibs wrapping as the name
suggests). And this would be consistent with COMMENT.

PLIST not done. Too long.