Add randomly generated data as test file

[sean0921]

for e.g.

the format of ts_????_b.dat should be:

year doy      hr       dn      sn      de      se      dh      sh

then split it to ts_????_[enu]_b.dat, those format should be: (actually no header in file content)

time(unit:year)    d[enu]  s[enu]