Changes to SGFML
- changed many attributes from "CDATA" to more strict definitions
like "NMTOKEN", "ID", or "IDREF"
- changed <game> to have a <gameheader> instead of <header> to
define allowed elements within different headers
- created two node types: <node> and <setup>. <setup> element
from V0.01 was renamed to <addstone>
- added <gameinfo> element - gameinfo elements have to be stored within it
- added types to <source>: RECORD, COMMENT, FILE
- more sophisticated <date>: contains <dateitem> now in order to
list more than one date and periods of time
- renamed <people> to <person> - looks more natural
- Example files: commented GTL game
and server game