isisdataeval Updates, fixes and additional documentation (#5163)

* isisdataeval fixes, improvements, updates and docs

isisdata_mockup.py - Added —tojson and —hasher parameters to improve utility

make_isisdata_mockup.sh - Fixed path to test data and added new parameters to the isisdata_mockup.py introduced in this PR

README.md - improved/clarified/updated documentation

* CHANGELOG.md correction and update

The CHANGELOG.md was incorrectly merged as the entry for this app was added in the wrong section, which seem wierd. This commit corrects and updates the log.

* isisdataeval documentation update via code review

* isisdataeval install $ISISROOT/bin/isisdata_mockup

isisdata_mockup.py - Install this script in $ISISROOT/bin as isisdata_mockup (no extension)

make_isisdata_mockup.sh - Renamed isisdata_mockup.py to isisdata_mockup

CMakeLists.txt - Add install command for isisdata_mockup

* isisdataeval mockup script minor docs change

* Rename isisdata_mockup.py to isisdata_mockup

To ease use and minimize confusion, renamed isisdata_mockup.py to isisdata_mockup (w/o the .py extension)

Updated documentation and install to reflect the change

* Resolved merge conflict and add CHANGELOG.md entry

This push resolves a merge conflict in the CHANGELOG.md

Added a entry to CHANGELOG.md to describe the PR changes.

* Removed hardcoded path in isisdata_mockup