Merge pull request #42 from xeno-by/master

implements Tree.parent and Tree.scratchpad, also renames SourceContext
Merge pull request #44 from xeno-by/master

miscellaneous minor updates
Merge pull request #45 from xeno-by/master

moves A.super[B] into a separate tree called Aux.Super
Merge pull request #46 from xeno-by/master

addresses pullrequest feedback
Merge pull request #47 from xeno-by/master

adds HostContext.owner
Merge pull request #48 from xeno-by/master

fixes test breakages
Merge pull request #50 from xeno-by/master

miscellaneous changes
Merge pull request #51 from xeno-by/master

more progress
Convert[A, B]
convertOrElse
Merge pull request #52 from densh/topic/convert

Convert[A, B]
Import.Name and Qual.Name
Pull request feedback
move Super to Qual
Merge pull request #53 from densh/topic/rename-both-either-names

Import.Name and Qual.Name