UFO Scientific updates MultiFreek to v2.2

UFO Scientific has updated MultiFreek to version 2.2.

Changes:

• The graph area became wider.
• Frequency marks were made more bright to be visible on certain monitors, moved down in the graphs.
• Different graph colors are now assigned to newly created instances.
• Performance optimizations: the plugin became about 19% less CPU consuming.
• Upgrade procedure described in the documentation.