Utility class renamed.
Using a unique function descriptor.
Code cleanup.
Function inv (invert filter) added.
Added HFunction3 type.
Function inv added to eDSL (Haskell and C++).
Minor changes
Test updated.
Added par function.
Added par function to eDSL (Haskell and C++).
Forward: PFQ_NOCLONE_FORWARD macro added.
Tests updated.
Merge branch 'experimental'