cleaned up SettingsOperation
cleaned up access/RadixCluster
Distinguish Union and UnionAll

This moves the expected behavior from UnionScan to UnionAll.
Union will remove duplicate positions while UnionAll will not.
cleaned up access/PrefixSum
cleaned up access/MergeHashTables
cleaned up access/RadixJoin
cleaned up access/NestedLoopEquiJoin
cleaned up access/Barrier
Merge pull request #85 from timbokopter/feature/cleanup_RadixJoin

cleaned up access/RadixJoin
Merge pull request #60 from timbokopter/feature/cleanup_SettingsOperation

cleaned up SettingsOperation
Merge pull request #87 from timbokopter/feature/cleanup_Barrier

cleaned up access/Barrier
Merge pull request #83 from timbokopter/feature/cleanup_PrefixSum

cleaned up access/PrefixSum
Merge pull request #84 from timbokopter/feature/cleanup_MergeHashTables

cleaned up access/MergeHashTables
Merge pull request #77 from timbokopter/feature/cleanup_RadixCluster

cleaned up access/RadixCluster
Merge pull request #86 from timbokopter/feature/cleanup_NestedLoopEquiJoin

cleaned up access/NestedLoopEquiJoin
Add binutils-dev to hyrise recipe.

Fixes #89
Merge branch 'master' of github.com:hyrise/hyrise
Merge pull request #81 from bastih/feature/Distinguish_Union_and_UnionAll

Distinguish Union and UnionAll
remove check for duplicate inputs; issue #88
Merge remote-tracking branch 'upstream/master'