Added cell labeling for exact mesh output.
Fixed an issue in BasisCache that could cause under-integration in cells with hanging nodes when doing testVsTest integrations (it could affect RieszRep, for example).
Minor tweaks to RieszRep (fixed misleading comments, added mesh accessor).
Added RefinementStrategy constructor that allows specification of a residual as a LinearTerm.
Added logic for LinearTerm-based RefinementStrategy.
Merge branch 'master' of github.com:CamelliaDPG/Camellia