Revise tiddler storage mechanism

[JeremyRuston]

It's proposed to add facilities to allow the storage and manipulation of tiddler data within TiddlyWiki:

• arbitrary metadata items against any tiddler
• support for 'lazy loading' where the header of a tiddler is provided in the HTML file and the body is retrieved from a server on demand
• support for multiple versions of the body of a tiddler
• support for embedded fields within tiddlers
• switching to the <PRE> element for value storage so as to be able to preserve white space properly

Struck-out entries were implemented for 2.1.

See this thread for some discussion of the proposed implementation:

 http://groups.google.com/group/TiddlyWikiDev/browse_thread/thread/ab28e78c6c9ca320/5ff7566919d63f6a?q=emd&rnum=4#5ff7566919d63f6a

[UdoBorkowski]

Regarding "support for embedded fields within tiddlers" see  Ticket #53 Add embedded data field features.

[UdoBorkowski]

The "MetaData?" feature (now called "Extended Tiddler Fields") is implemented in "contributors/UdoBorkowski/branches/2.1" (changeset:368 to changeset:378)

[MartinBudden]

Remaining items split out into tickets #209, #210 and #211.