Greek translation

First attempt for translating Greek (Greece)
Corrections to el-GR translations

Some minor corrections to translations.
fr-FR translation of the core plugin readme
fr-FR translation of the hint about external tiddlers
fr-FR translation for the unpackplugin command help
fr-FR translation for the editions command help
Add direct link to github ribbon plugin

The former documentation referenced a plugin but left no easy way to
link to it. Also, the misleading text claiming a title also confused me.
I had to do some creative greping the git files to hunt it down.

Adding a TiddlyWiki link around the plugin links to the actual tiddler
that a reader could easily copy. This also deprecated the need for the
misleading title.
Wrap page control previews in position:relative

Fixes #1031
Merge pull request #1032 from sukima/feature/github-ribbon-plugin-link

Add direct link to github ribbon plugin
Corrections to el-GR translation

some minor corrections
Merging el-GR
Fix to el-GR translation

@access-denied this is for consistency with the other languages.

I acknowledge that there it’s a problem at the moment that languages
can’t expose a localised name; it would make more sense to use the
localised language name in the menu.
Use Greek translation in introduction edition
Tweaks "Tiddlers" docs

Thanks for the prompt @FND - I’ve pushed this version to
http://tiddlywiki.com/#Tiddlers and
http://tiddlywiki.com/static/Tiddlers.html
disable enqueueTiddlerEvent during plugin switching
Extend Cecily

Two new features: you can set the tiddler width via an attribute on the
list widget, and specify a rotation factor in the map.
Updates to "introduction" edition
Merge branch 'pr/1034'
Merge pull request #1025 from xcazin/trans

Spotted thanks to http://tiddlywiki.com/prerelease/editions/translators/index.html
fr-FR description for RecentSystemTiddlers filter group