erp5_web: update caching policy behavior. Add possibility to select caching policy from WebSite and WebSection

erp5_web: simple yet effective caching policy rules

erp5_web: caching policy fix update names

erp5_web: introduce caching policy category for Web Site and Web Section

erp5_web: fix test related to caching policies

erp5_web: Fix Base_getWebDocumentDrivenModificationDate for empty web sites.

erp5_web: fix Base_getWebDocumentDrivenModificationDate

erp5_web: optimize , fix caching policy

erp5_web: update Base_getWebDocumentDrivenModificationDate portal type list