Improve detection results from liquibase

[AyanSinhaMahapatra]

Description

1. On scanning https://github.com/liquibase/liquibase/tree/v4.19.0/liquibase-dist/src/main/archive/licenses/commercial/README.rst we detect the 3 main license references correctly:

• apache-2.0
• lgpl-2.1
• agpl-3.0

But this could be better in the following ways:

• Both agpl-3.0 and agpl-3.0-plus are in the license expression, should be resolved to only agpl-3.0
• license expression can be simplified
• We do not detect anything on the line: Liquibase License Information (Used by Liquibase Commercial) though this doesn't have any of the commercial license terms just a vague reference.

Maybe this should be detected as a commercial-license reference?

2. There https://github.com/liquibase/liquibase/blob/v4.19.0/liquibase-dist/src/main/archive/licenses/commercial/Liquibase%20Pro%20EULA%20Software%20License%20Subscription%20and%20Support%20Agreement.txt:

where we were detecting just unknown before. But now we are detecting unknown-license-reference, proprietary-license, unknown (and an apple-attribution-1997 which is a heuristics bug, this should be filtered out)

3. There's also licenses/oss/futc.txt, licenses/oss/ipla.txt, licenses/oss/README.rst where we can do improvements at https://github.com/liquibase/liquibase/tree/v4.19.0/liquibase-dist/src/main/archive/licenses/oss

System configuration

For bug reports, it really helps us to know:

• What OS are you running on? (Windows/MacOS/Linux) Ubuntu
• What version of scancode-toolkit was used to generate the scan file? v31.2.4 and v32.0.0rc1
• What installation method was used to install/run scancode? (pip/source download/other) source archive

Scan Results

liquibase-licenses-v32.0.rc1.json.txt

liquibase-licenses-v31.2.4.json.txt

Also scans on this file: https://github.com/tensorflow/tensorflow/blob/master/tensorflow/lite/java/ovic/Winner_OSS_Template.md

tensorflow-v31.2.4.json.txt
tensorflow-v32.0.0rc1.json.txt