we were using an very ancient TiddlyWiki version, basically
unaltered since the start of the Lumiera project.
Recent Firefox versions (starting with FF-17) effectively
removed the ability for JavaScript code to get additional
privileges for writing local files; this change seriuosly
undermines the usability of TiddlyWiki and a lot of similar
portable local JavaScript applications.
The original author of TiddlyWiki, Jeremy Ruston, has written
a Firefox plug-in to work around this restriction; this prompts
us to upgrade to a recent TiddlyWiki version as well.
The good news is: recent TiddlyWiki versions are able to import
Tiddlers from older Wikis without much hassle.
