Convert libmesh_cast_{ptr,ref} -> cast_{ptr,ref}

Refs #3737.
Merge pull request #3738 from jwpeterson/libmesh_cast

Convert libmesh_cast_{ptr,ref} -> cast_{ptr,ref}
Disable test in recover mode (#3735)
Reenable and set num_steps to 6 (#3735)
Merge pull request #3760 from dschwen/terminate_3735

Fix test in recover mode
Tests for issue #3743