Fix markup error (closes #2519), and make the default action when creating an attachment to '''not''' replace an existing attachment.
Fix markup error (closes #2519), and make the default action when creating an attachment to '''not''' replace an existing attachment.

git-svn-id: f68c6b3b1dcd5d00a2560c384475aaef3bc99487@2673 af82e41b-90c4-0310-8c96-b1721e28e2e2

moreati/trac-gitsvn,exocad/exotrac,dokipen/trac,dafrito/trac-mirror,dafrito/trac-mirror,dokipen/trac,moreati/trac-gitsvn,exocad/exotrac,moreati/trac-gitsvn,dafrito/trac-mirror,exocad/exotrac,exocad/exotrac,dafrito/trac-mirror,dokipen/trac,moreati/trac-gitsvn