Conary 2.1.8 is a maintenance release.

• Added abort-on-error to conary rollback command which causes rollback be aborted if any pre scripts fail. (CNY-3327)
• Fixed bug introduced in Conary 2.1.0 which caused conary to ignore ownership differences for executable files. (CNY-3354)
• When SetModes() is called twice, honor the last invocation with regard to setuid and setgid, including if neither setuid nor setgid is set. Also, make it possible to override setuid and setgid bits in a derived package. (CNY-3344)
• Fixed a bug in Conary 2.1.0 which caused updates to fail because a temporary table persisted across jobs. (CNY-3339)
• Changed default behavior of imageGroup flag in group recipes so that checkOnlyByDefaultDeps is now set to True (CNY-3356)