A few of these prototypes were already in import-csv.h.
Put them in an 'extern "C" { ... }' block.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
Make functions in core/file.c, core/parse.c and core/import-csv.c
that were not used outside their translation unit of static linkage.
parse_date is moved from core/file.c to core/import-csv.c, since it
is used only there.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
