Only fetch folders associated with this category

The old logic fetched folders associated with this category as well
as any of its subcategories, which makes some layouts almost impossible
to get right. The new one only fetches folders directly associated with
this category.

This change is backwards incompatible with previous versions, and can
potentionally radically alter how a site behaves. An upgrade path
doing a single-pass run that duplicates the old behavior using the
new setup is therefore required before merging.
Mase it possible to filter categories in search from templates
Force higher quality on generated images
Merge branch 'master' into categoryFolderCleanup
Merge branch 'master' into categoryFolderCleanup
Merge branch 'master' into categoryFolderCleanup
Renaming
Merge remote-tracking branch 'origin/categoryFolderCleanup'

Conflicts:
	lib/LizztCMS/Schema/LzCategory.pm