Create concat_worktitles.sql

function to concatenate the preferred title and the English non-preferred title (if it exists).
Rename functions/Cinefiles/concat_worktitles.sql to functions/cinefiles/concat_worktitles.sql
Update concat_worktitles.sql

Changed parameter and variable names. Added notes on where this function should be created.
Merge pull request #60 from lkvoong/master

BAMPFA-129