DR7_v1.3 Update

Comparing with the previous verison of DR7,  More than 40 000 spectra are added in DR7_v1.3. The plates and the corresponding observation dates are listed as follows:

| 2011-11-12 | GAC_080N28_B1   |
| 2012-01-26 | GAC_055N28_M1   |
| 2012-01-26 | GAC_122N29_M1   |
| 2012-02-16 | GAC_106N28_F1   |
| 2016-11-03 | M31356N43M1     |
| 2014-09-26 | M31019N31B1     |
| 2014-10-17 | M31001N35M2     |
| 2014-10-18 | M31010N47B1     |
| 2014-10-21 | M31005N35M1     |
| 2014-10-26 | M31011N44M1     |
| 2014-10-27 | M31017N47B1     |
| 2014-11-02 | M31010N47B2     |
| 2014-11-11 | M31020N28B1     |
| 2014-11-13 | M31019N33M2     |
| 2014-11-14 | M31028N29B1     |
| 2014-11-21 | M31020N28M1     |
| 2014-11-22 | M31005N35B1     |
| 2014-11-23 | M31000N42B1     |
| 2014-11-23 | M31000N42B2     |
| 2015-10-05 | M31_000N44_B1_1 |