aggregation 5.x-4.7

- Added more finegrained perms
- Fixed aggregator2 migration script and made it work and become more accurate
- Allowed specifying image size on aggregation full view and teaser view with option to display none
- Made feed page to show its children items
- Changed default values in forms and used isset checks to specify defaults
- Added ability to specify filter of aggregated items
- Fixed issue related to open_basedir and safe_mode
- Fixed issue related to clean urls being passed from feed to first child
- Fixed issue related to long taxonomy list
- Changed RSS 2.0 handler priority for body