vchoi_fork

[svn-r4975] Description:
    Users were alarmed by the OFFSET overflow and GB file size tests.
    Those tests only checks the limits of the MPI implementation, not
    really as an error.
Solution:
    Changed the VRFY macro to indicate it is an "ERROR".
    Modified the INFO macro to print messages as "REMARK (not an error)"
    so that users would not be alarmed.

    Added an explanation string in the GB file size write/read.
Platforms tested:
    eirene and modi4 (parallel)