Changes to Generate Photo Grid PDF

added the new optional request property format

added the new optional request property people/items/candidateNumber

added the new optional request property people/items/forename

added the new optional request property people/items/form

added the new optional request property people/items/surname

added the new optional request property columns

added the new optional request property fill

added the new optional request property fitToPage

added the new optional request property grouped

added the new optional request property hideFooter

added the new optional request property hideGeneratedDate

added the new optional request property hideHeading

added the new optional request property hideLogo

added the new optional request property hidePageNumbers

added the new optional request property landscape

added the new optional request property omitMissingPhotos

added the new optional request property people/items/group