Remove deprecated context properties (issue 560030044 by address@hidden)

[lemzwerg]

LGTM.  This issue also adds some scheme code and a conversion rule –
they are different commits, right?


https://codereview.appspot.com/560030044/diff/557800043/scm/define-context-properties.scm
File scm/define-context-properties.scm (right):

https://codereview.appspot.com/560030044/diff/557800043/scm/define-context-properties.scm#newcode609
scm/define-context-properties.scm:609: merge rests when this is set to
true.")
While you are at it, please fix indentation (i.e., no indentation for
the continuation line).

https://codereview.appspot.com/560030044/