add mutable_type
typedef to collection and user collection
#718
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BEGINRELEASENOTES
mutable_type
typedef to collection to simplify inferring mutable type. Addmutable_type
typedef to user collection for compatibility with other collections.ENDRELEASENOTES
As suggested in #626 (comment) some code can be simplify if had a typedef for mutable type instead of going through patter like
collection::value_type::mutable_type
mutable_type
is already present in link collection. I propose to add it to user data collection so all the collections offer similar API even if in that case it's redundant