vchoi_fork

[svn-r2674] 
Purpose:
    1. fix size of dimensional name list so that the size of dimensional name in dumper output
will not change because of different versions of hdf library(h4toh5util.h and h4toh5sds.c).
    2. fix bzero routine for windows platform(h4toh5util.h,h4toh5util.c,h4toh5anno.c,h4toh5main.c,
	h4toh5sds.c)
Description:
    1. change the MAX_DIM_NAME into 276(MAX_NC_NAME +dimension group name) and hopefully we will
    not expand the size of MAX_NC_NAME(currently 256) for a long time.
    2. create a new routine(h4toh5_ZeroMemory) to zero out memory. Use ZeroMemory in windows and
	bzero at UNIX.
Solution:
    see Description.
Platforms tested:
    LINUX(eirene),WINDOWS 2000, sun 5.6(baldric and arabica),HP-UX11(opus),DEC(gondolin),IRIX 6.5(paz).