
- add a rule 'visibly', which entails that it should always
be visible after adding; to achieve this any rules in scopes
between the current scope and the scope labeled with the
specified label with the same key are removed. For addition
of rules in the current scope this is the same as normal
rule addition.

svn path=/trunk/StrategoXT/; revision=7477

Apanatshka/strategoxt,metaborg/strategoxt,metaborg/strategoxt,metaborg/strategoxt,metaborg/strategoxt,Apanatshka/strategoxt,lichtemo/strategoxt,lichtemo/strategoxt,lichtemo/strategoxt,Apanatshka/strategoxt,lichtemo/strategoxt,Apanatshka/strategoxt,lichtemo/strategoxt,Apanatshka/strategoxt,metaborg/strategoxt