New version 4.2.0 of PHP DataGrid - release

The new version 4.2.0 of PHP DataGrid is available for downloading from here.

Special THANKS to all who was helping this project. I think we have now a really stable version. Any way, the list of 'TODO' is full of features I need to add still.

There are many changes in this version. Read carefully Getting Started.

Two short remainders:

1) Remember! This is not an updatable version. If you