[libcalamares] Weigh unpackfs extra heavy

- This is a gross hack, which hard-codes unpackfs as much-heavier
   than other Python modules.

src/libcalamares/PythonJob.cpp

@@ -170,7 +170,8 @@ namespace Calamares
 {
 
 
-PythonJob::PythonJob( const QString& scriptFile,
+PythonJob::PythonJob( const QString& instance,
+                      const QString& scriptFile,
                       const QString& workingPath,
                       const QVariantMap& moduleConfiguration,
                       QObject* parent )
@@ -179,12 +180,18 @@ PythonJob::PythonJob( const QString& scriptFile,
     , m_workingPath( workingPath )
     , m_description()
     , m_configurationMap( moduleConfiguration )
+    , m_weight( (instance == QStringLiteral( "unpackfs" )) ? 8.0 : 1.0 )
 {
 }
 
 
 PythonJob::~PythonJob() {}
 
+qreal
+PythonJob::getJobWeight() const
+{
+    return m_weight;
+}
 
 QString
 PythonJob::prettyName() const

src/libcalamares/PythonJob.h

@@ -21,6 +21,8 @@
 
 #include "Job.h"
 
+#include "modulesystem/InstanceKey.h"
+
 #include <QVariant>
 
 namespace CalamaresPython
@@ -36,7 +38,8 @@ class PythonJob : public Job
 {
     Q_OBJECT
 public:
-    explicit PythonJob( const QString& scriptFile,
+    explicit PythonJob( const QString& instance,  // TODO: InstanceKey
+                        const QString& scriptFile,
                         const QString& workingPath,
                         const QVariantMap& moduleConfiguration = QVariantMap(),
                         QObject* parent = nullptr );
@@ -46,6 +49,8 @@ public:
     QString prettyStatusMessage() const override;
     JobResult exec() override;
 
+    virtual qreal getJobWeight() const override;
+
 private:
     friend class CalamaresPython::Helper;
     friend class CalamaresPython::PythonJobInterface;
@@ -56,6 +61,7 @@ private:
     QString m_workingPath;
     QString m_description;
     QVariantMap m_configurationMap;
+    qreal m_weight;
 };
 
 }  // namespace Calamares

src/libcalamaresui/modulesystem/PythonJobModule.cpp

@@ -49,7 +49,7 @@ PythonJobModule::loadSelf()
         return;
     }
 
-    m_job = Calamares::job_ptr( new PythonJob( m_scriptFileName, m_workingPath, m_configurationMap ) );
+    m_job = Calamares::job_ptr( new PythonJob( name(), m_scriptFileName, m_workingPath, m_configurationMap ) );
     m_loaded = true;
 }