Updated feature summary

I have added a couple of features to my earlier post on MySQL Cluster Features - what they are and what they do.

The features that have been added to the feature list are:

• Increased max number of nodes in a single MySQL Cluster (CGE 6.2)
• Page allocation (CGE 6.2)
• Page deallocation (CGE 6.3)
• OPTIMIZE TABLE (CGE 6.3)
• epoll (CGE 6.3)