psql → interfaces Relation

File in src/bin/psql	Includes file in src/interfaces
command.c	libpq / libpq-fe.h
command.c	libpq / pqexpbuffer.h
common.h	libpq / libpq-fe.h
copy.c	libpq / libpq-fe.h
copy.c	libpq / pqexpbuffer.h
copy.h	libpq / libpq-fe.h
input.h	libpq / pqexpbuffer.h
print.h	libpq / libpq-fe.h
psqlscan.h	libpq / pqexpbuffer.h