Major changes to the Rico 3 server control for SimpleGrids - much improved control...

Major changes to the Rico 3 server control for SimpleGrids - much improved control over the way the grid exports to Excel. Also, MenuEvent for grids now defaults to none. LiveGrid panels are now ColGroups. LiveGrid now exposes its sqlCompatibilty object. MenuEvent and dbDialect are now enums in the .net server control - you can no longer assign a string to them.

git-svn-id: svn://svn.code.sf.net/p/openrico/code/trunk/rico3@86 53df2df2-7ab5-4331-af62-ea79255fa4e2