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Created Mutable and Immutable SetFactories to deal with the spectacular
performance regression which accompanies the use of AddingBuilder on
mutable Sets. Because '+' now creates a new collection even on mutable
sets, AddingBuilder on a 100K element collection will create garbage
sets of size 1,2,3...,99,999 before finishing. Thankfully there is
already GrowingBuilder.
See test/files/run/adding-growing-set.scala for a demonstration.
This patch is not complete: in particular, SortedSet and SetBuilder need
attention. Unfortunately there is a combinatorial jump in the number of
Addable/Growable divisions which arises once one tries to accomodate
both Sorted signatures (taking an Ordering) and unsorted signatures, so
will come back to it after receiving counsel.
Review by odersky.
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