CGridListCtrlEx Version 2.4

Doxygen ver. 1.8.9

Updated with version 2.2 changes

Added extra check for duplicate groupids when creating new groups on …

…Vista/Win7+

Updated article with version 2.0 changes

Updated release date for ver. 1.9

Changed default version to Windows XP

Better description of changes in ver. 1.7

Fixed GroupHitTest for Vista

Fixed comment