scoping issues
prefix cache keys with version numbers to avoid cache conflicts when upgrading
bugfixes for roadmap pages not properly collapsing closed milestones
don't clear output buffer when rendering json
allow specifying workflow scheme and issue type scheme when creating projects (fixes issue #1655)
unify user / team search backend code
minor ui fixes for project hierarchy pages
show number of projects and issues per scope in scope overview
other small bugfixes
add event hooks for statistics to allow modules to provide more statistics in project statistics pages