Bug 42625 Default for compiler compliance level
From a mail from Philippe: In order to reflect the migration to 1.4, compiler settings for JDT/Core projects should be: - compiler compliance 1.4 - source compatibility 1.3 - generated classfile compatibility 1.2 These are 1.4 compilers defaults anyway. JDT/UI got informed that their defaults in 1.4 compliant mode do not match expectation. Martin, can you please change our defaults.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/CompilerConfigurationBlock.java
GridLayout layout= new GridLayout();
		layout.numColumns= nColumns;
					
		Composite composite= new Composite(folder, SWT.NULL);
		composite.setLayout(layout);
		Label description= new Label(composite, SWT.WRAP);
		description.setText(PreferencesMessages.getString("CompilerConfigurationBlock.unused.description")); 
		GridData gd= new GridData();
		gd.horizontalSpan= nColumns;
		gd.widthHint= fPixelConverter.convertWidthInCharsToPixels(50);
		description.setLayoutData(gd);
		
		Composite combos= composite;
		
		String label= PreferencesMessages.getString("CompilerConfigurationBlock.pb_unused_local.label"); 
		addComboBox(combos, label, PREF_PB_UNUSED_LOCAL, errorWarningIgnore, errorWarningIgnoreLabels, 0);
		label= PreferencesMessages.getString("CompilerConfigurationBlock.pb_unused_parameter.label"); 
		addComboBox(combos, label, PREF_PB_UNUSED_PARAMETER, errorWarningIgnore, errorWarningIgnoreLabels, 0);
		
		int indent= fPixelConverter.convertWidthInCharsToPixels(2);
		label= PreferencesMessages.getString("CompilerConfigurationBlock.pb_signal_param_in_overriding.label"); 
		addCheckBox(combos, label, PREF_PB_SIGNAL_PARAMETER_IN_OVERRIDING, enabledDisabled, indent);
		
		label= PreferencesMessages.getString("CompilerConfigurationBlock.pb_signal_param_in_abstract.label"); 
		addCheckBox(combos, label, PREF_PB_SIGNAL_PARAMETER_IN_ABSTRACT, enabledDisabled, indent);		
		label= PreferencesMessages.getString("CompilerConfigurationBlock.pb_unused_imports.label"); 
		addComboBox(combos, label, PREF_PB_UNUSED_IMPORT, errorWarningIgnore, errorWarningIgnoreLabels, 0);
		label= PreferencesMessages.getString("CompilerConfigurationBlock.pb_unused_private.label"); 
		addComboBox(combos, label, PREF_PB_UNUSED_PRIVATE, errorWarningIgnore, errorWarningIgnoreLabels, 0);