vchoi_fork

[svn-r3119] Purpose:
    New features
Description:
    Some testers found the filename lengths too short.
    Changed it to use the FILENAME_MAX usually defined in stdio.h.
    If not, set it to 512 which should be sufficient for users
    but should not exceed any system limits.

    Also added a new test parameters of ndatasets so that the tester
    can specific a different number of datasets for the multiple
    datasets tests.

    Changed the datatype of datasets created to DOUBLE.  This eliminates
    the current racing conditions.  But the racing bugs during conversion
    still need to be tracked down and squashed.
Platforms tested:
    Modi4 -64.