hdf5_msb

[svn-r2678] 
Purpose:
    fixing output format of character array converted from hdf4 vdata.
Description:
    Now one dimensional chactacter array can be outputed as one H5 string instead of string of array before.
Solution:
   modify gen_h5comtype() so that when we detect the datatype is hdf5 string, we will merge hdf4 fieldorder into H5T string size and output the whole character array into  hdf5 string(with string size = size of the array length).
Platforms tested:
    eirene(LINUX), arabica(sun 5.6)