Added getCompactTitle support (as well as getCompactLogicalPath) which is useful for sites were the depth of categories in large. Actually, this should be teh standard default everywhere. Also added some aggressive caching. Still to be discussed if it is that good or not.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@13198 20353a03-c40f-0410-a6d1-a30d3c3de9de