Added 0.8.9 changes made to app/code/community dir
Stil need to verify some things there before releasing a test version (sql setup, ...)
some notice and warning errors fixed (forgot an initialization)
fixed typo in categories custom column
added 0.8.9 changes made to skin/adminhtml/default/default dir
added 0.8.9 changes made to app/etc/modules dir
added 0.8.9 changes made to app/locale dir
added 0.8.9 changes made to app/design/adminhtml/default/default dir
added 0.8.9 changes made to js dir
lots of fixes / changes to 0.8.9 setup file
fix note
formatting
fix filtering on attributes
shared products grid features with the category products tab (except export, that needs some specific code)
fix for creation of new non-predefined options sources
filled markdown
Merge branch '0.8.9' of https://github.com/mage-eag/mage-enhanced-admin-grids into 0.8.9
added new custom columns : inventory fields for the products grid + minor fixes
completed the markdown
fix for filtering on new price columns
fixed missing return that was preventing some custom inventory columns from being filtered
fix for custom columns (filters map on collection prepared too early, so that it was not preventing ambiguous filters)