Fix crash if try to open-create an existing non-regular file

Signed-off-by: Frank S. Filz <ffilzlnx@mindspring.com>
MORE Relax permission checking on OPEN CREATE

Signed-off-by: Frank S. Filz <ffilzlnx@mindspring.com>
MORE Use sysconf to get proper size of getpw.* and getgr.* buffers

Signed-off-by: Frank S. Filz <ffilzlnx@mindspring.com>
MORE Add export option to enable use of readdir results for negative dirent cache

Signed-off-by: Frank S. Filz <ffilzlnx@mindspring.com>