Release 5.20.2

This is mostly a bug fix release enhancing stability when validating
and converting models.

• New features / improvements

  • Access to error logs from the C API

  • Attributes of the ModelHistory can now be accessed from
    const objects.

  • The FBC V3 package has been updated to reflect the latest
    specification. There are now optional attributes fbc:reaction2
    on the FluxObjective and fbc:variable2 on the
    UserDefinedConstraintComponent.

• Bug fixes

  • A bug converting / validating models with the 'comp' package
    has been fixed.

  • A crash when inferring units has been resolved.

  • A fix to the CMake Build system ensures that check for dependencies
    is more robust. Thanks to first time contributor @adelhpour

  • The type of the FBC V3 coefficient attribute on the
    UserDefinedConstraintComponent has been corrected, it was mistakenly
    a double before, now it has been corrected to be a SIdRef as
    described in the specification.