lollipops: New legends, Uniprot mappings, Adobe fixes, friendlier errors.

This release includes a number of improvements:

• Switched to Uniprot for identifier mapping due to BioMart's stability issues and API flux. It is now possible to map many more identifier types!
• Works around an issue when trying to edit generated diagrams in Adobe products.
• Adds an option for including a legend in generated diagrams.
• Simplifies default output settings when using the command-line tool.
• Shows a warning message on windows when used incorrectly (e.g. by clicking on it).