This commit addresses multiple issues. ContributionTool will no longer corrupt...

This commit addresses multiple issues. ContributionTool will no longer corrupt the uid generator thanks to some improvements which are also related to ERP5Type.Core.Folder and ERP5Type.WevDAVSupport. The new crawler is now in place. This crawler is now based on alarms and requires some alarm configuration. It is much less intrusive in terms of activities. This version of ContributionTool also introduces the API to distinguish index pages from context pages in a crawling process. This feature is required to index a mailing list for example.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@15679 20353a03-c40f-0410-a6d1-a30d3c3de9de