So, it turns out that just freeing
the nc4_info is not enough;
The root group must also be reclaimed.
So, it appears the best approach
is to invoke an abort on the
failed file.
The in-memory files can be made persistent if nc_create is called with
NC_DISKLESS|NC_WRITE flags set. Initial test case also included.
- Modified ncio mechanism to support
multiple ncio packages; this is so we
can have posixio and memio operating
at the same time.
- cleanup up a bunch of lint issues (unused variables, etc).
