Add int_fmt procedure for integer(lint) variables.
Add int_fmt procedure for integer(lint) variables.

For convenience, wrap int_fmt procedures for standard and lint integers
into the same int_fmt interface.

hande-qmc/hande,hande-qmc/hande,hande-qmc/hande,hande-qmc/hande,hande-qmc/hande,ruthfranklin/hande