* Added $Global.skin as first attempt to move certain skins in a namespace protected from customization
* Very much improved image editor interface
* Thoroughly fixed and tested image upload, fetching, thumbnail generation and replacement
* Set application's charset to UTF8
* Added Layout.getFile() method returning the layout's directory as helma.File
* Simplified Layout.getSkinPath() method (still work in progress)
* Replaced occurrences of Site.language with Site.locale
* Modified some wording
* Added slight b/w compatibility fix in Story.macro_filter() method
* Added timex factor in Story.getDelta() method to prevent counting edits as site updates in-beteen 10 minutes
* Moved site-related aspect hooks to Site prototype of compatibility module
* Removed obsolete conversion code in compatibility module (has moved to updater app)
* Re-included spacer_macro() method in compat. module
* Temporarily overwrote HopObject.renderSkin() method to debug skin rendering process
* Replaced individual legacy macros of Layout prototype by appropriate code in onUnhandledMacro() method (compat.)
* Reflect legacy macros of Layout prototype in value() method of compat. module
* Added and improved compatibility methods
* Implemented support for renamed prototypes in updater app (still needs to be applied for database, too)
* Removed obsolete navigation skins
* Moved page navigation skins into Global.skin
* Removed remaining obsolete RSS skin
* Moved admin navigation into subskin and added it via overwritten skin_macro in Admin prototype
* Removed obsolete sysmgrnavigation.skin from Root
* Renamed style.skin to stylesheet.skin (this could be hazardous regarding b/w compatibility...?)
* Modified order of featured collection in Stories prototype
* Re-added DB column and property for last visit date of a user (now simply called "visited")
