Works are lazily/spftly loaded now.
Generalized table generation a bit.
Fixed the webapp.
Added XML file cache.
Split the Parser (and the parsees) up.
Removed added name in Names.
Some renamings.
Existence checker.

--HG--
rename : viewer/src/main/scala/org/podval/judaica/xml/Load.scala => viewer/src/main/scala/org/podval/judaica/xml/XmlFile.scala
Make (and show) list of content formattings.
Generalized Table: introduced Column.
Generalized Html class to handle global and work-specific stylesheets.
Structures and Selectors traits adapts Work, Slector, Div...
Existence class cleaned up.

--HG--
rename : viewer/src/main/scala/org/podval/judaica/viewer/Existence.scala => viewer/src/main/scala/org/podval/judaica/viewer/Exists.scala
rename : webapp/src/main/scala/org/podval/judaica/webapp/Existence.scala => webapp/src/main/scala/org/podval/judaica/webapp/Exists.scala