lampepfl/dotty — pull request #142 by DarkDimius (2014-07-16 09:07:01+00:00)
Title: Fix using of wrong period for creating nested ctx in TreeTransforms

`owner` for nestedContext in `TreeTransforms` was assigned
using initial period of whole `TreeTransforms` block.
That is incorrect as denotation for this owner could have been
create by some phase in this block and be non-existent at the initial period.