IdStory Identity Manager

• I added information about modifier and when was request modified to the request detail.
• Same columns I added to the table of all requests (on unresolved and to archived too).
• I added new filter for search request by modified field.
• I fixed problem with sorting on table with archvived requests (sorting on this table didn't work well).
• I created test for new filter.

Commit: https://github.com/bcvsolutions/CzechIdMng/commit/b74c8ac34cd7cd98239e757662a806509d2cb2cb
Test for new filter: https://github.com/bcvsolutions/CzechIdMng/commit/bf4ce76c9daf9061cbc7029d410149d70b799d3f

I did test and review, it works, thx!