Import flask-oldsessions for sagenb 0.10.8.2 see issue #280

Package-Manager: portage-2.2.8-r1
adding flask-oldsessions to keywords
match sagenb keywords otherwise repoman not happy

Package-Manager: portage-2.2.8-r1
bump to include dependency to flask-oldsessions issue #280

Package-Manager: portage-2.2.8-r1