PR: Add unlimited sparql updates #99
Description
Skosify has for a long time been limited to a single sparql update query and single post transformation sparql update query. Today I forked Skosify and implemented unlimited sparql updates and post sparql updates.
Unlimited sparql updates are implemented by introducing two new sections, sparqlupdates and postsparqlupdates, to skosify config. These new sections are expected to contain only keys that are sparql queries. The names of the keys do not matter, they only have to be unique. All the values of the keys in these sections are read to a list, from which they are executed on the graphs in the order they appear in the configuration file.
In addition, I implemented a sparql_prefixes configuration key, which can contain sparql prefixes that will be shared by all sparql queries. It's rational is to make configuration file shorter and easier to read, when it contains many queries. The contents of sparql_prefixes key is prepended to all sparql queries before they are executed.
The implementation is quite straight forward and is backwards compatible with older configuration files. You can look the changes from the link below:
https://github.com/devseppala/Skosify/commits/sparqlupdates/
I created this issue for discussion before making a pull request.