Fixes for updates in the objects after the import of data

Description

Fixes and improvements for the updates in the objects after the import of data:

• update the plots after the import of data
• better logic to track the column dependencies in the plots, cover now all plot types and not only xy-curve and histogram, and properly update these plots after the import
• refactored the code in Project::descriptionChanged() and in Project::aspectAddedSlot() to update the column dependencies for all plot types
• simplified and more complete structure in column's "used in" menu to track the column dependencies for all plot types
• update spreadsheet calculations (column values defined via formulas) after the import of data

Conformity

• Changelog entry
• Unit tests
• Update INSTALL
• Downport
• Fixes: #836 (closed)

When external dependencies are removed

• Reporting to ...