- Declare mtabhead as an extern in mounttab.h and define it only in
mounttab.c.
- Remove shared global `verbose' and instead pass it as a parameter.
- Remove the `mtabp' argument to read_mtab(). It served no purpose
whatsoever, although read_mtab() did use it as a temporary local
variable.
- Don't check for impossible conditions when parsing mounttab, and
do detect zero-length fields.
- Correctly test for strtoul() failures - just testing ERANGE is wrong.
- Include a field name in syslog errors, and avoid passing NULL to
a syslog %s field.
- Don't test if arrays are NULL.
- If there are duplicates when writing out mounttab, keep the last
entry instead of the first, as it will have a later timestamp.
- Fix a few formatting issues.
Update rpc.umntall and umount to match the mounttab interface changes.
