Update resource filename logic
This branch updates the resource filename logic per discourse topic 212
- Removes file extension check in smtkCore (smtk::attribute::Write)
- Removes setLocation call when loading .sbt file from UI (pqSMTKAttributeReader)
- Adds .smtk check to paraview extension (pqSMTKSaveResourceBehavior.cxx)
Backport: release
Edited by John Tourtellott