Added support for converting unsorted problems to multi-sorted problems via sort inference and monotonicity.  Minor cleanup.
Adding example proof signatures for LFSC.
Merge branch 'master' of https://github.com/CVC4/CVC4
Multiple fixes for datatypes theory solver: add support for parametric datatypes in type enumerator, fix infinite loop in type enumerator, fix fairness issue for splitting (moves constructor selection into model generation procedure), fixes bug 532, find conflict for constructor with conflicting label eagerly.  Add representive flattening for quantifiers (currently disabled). Other minor cleanup.