0.13dev: Preserves permissions and ownerships of old attachments directory for new attachments directory if possible
0.13dev: Preserves permissions and ownerships of old attachments directory for new attachments directory if possible

Part of #10313.


git-svn-id: f68c6b3b1dcd5d00a2560c384475aaef3bc99487@11040 af82e41b-90c4-0310-8c96-b1721e28e2e2

dafrito/trac-mirror,dafrito/trac-mirror,dafrito/trac-mirror,dafrito/trac-mirror