Version support for datastore/Howto

Backup
If you've used Sugar before, it is highly recommended to create a backup of your data store as it will be updated on first startup and cannot be read by older versions of Sugar afterwards: cp -a ~/.sugar/default/datastore ~/.sugar/default/datastore.v2

Prerequisites
You need to have sugar-jhbuild installed as usual. Make sure it's fully up-to-date and all dependencies are installed.

Installation
Switch to the  JHBuild module set by replacing moduleset = 'sugar' with moduleset = 'sugar-versionsupport' in.

Move away the old sources for the,   and   packages (JHBuild cannot switch between different git modules): cd sugar-jhbuild for pkg in sugar{,-datastore,-toolkit} ; do    mv "${pkg}" "${pkg}-upstream" done

Get and build the new sources: cd sugar-jhbuild ./sugar-jhbuild updateone sugar{,-datastore,-toolkit} ./sugar-jhbuild buildone sugar{,-datastore,-toolkit}

Usage
Run as usual: cd sugar-jhbuild ./sugar-jhbuild run sugar-emulator --fullscreen

Please note that it's based on my VNC support branch, so instead of Xephyr you'll get a VNC viewer. You shouldn't notice much of a difference, with the exception of non-US keyboards working properly. To bring up the VNC menu press F8.