Reorganise Cluster installation information (currently called 'MySQL Cluster Multi-Computer How-To') along platform-centric lines. Reorganise Linux installation by method (binary, RPM, source). Get rid of references to 'Multi-Computer' and 'How-To'. Improve Upgrade/Downgrade section. Sort info by release series. Get rid of charts + bulleted lists and replace with per-series tables containing info by release.
