Version bump

Package-Manager: portage-2.1.11.31
Version bump, remove rc1 ebuild

Package-Manager: portage-2.1.11.31
Version bump, remove rc1 ebuild

Package-Manager: portage-2.1.11.31
Version bump, remove rc1 ebuild

Package-Manager: portage-2.1.11.31
Version bump, remove rc1 ebuild

Package-Manager: portage-2.1.11.31
Version bump, remove rc1 ebuild

Package-Manager: portage-2.1.11.31
Unmask Sage 5.6
Merge branch 'master' of https://github.com/cschwan/sage-on-gentoo