proof-of-concept pdf export / lammy printing

LammySheet.php contains the logic for filling up an A4 sheet
(for single-sided OR double-sided printing).
CharLammy.php contains hardcoded char info, this needs to be
parameterized / integrated in CakePHP.
More lammy types should be added.

As this code is from 2009, there's probrably also a newer version of fpdf.
add some json api links to start page
put the home.ctp on the todo list
add helper for creating json (sub)listings
make use of the Snippet helper
move d-m-Y date formatter to own DateHelper
move json encoding to SnippetHelper
simplify DateHelper, add full date format function
lots of foreach( plural as singular ) in views

also update/use DateHelper