keyboard: Write the keyboard model and layout settings to the root mount point.

This is implemented as a new SetKeyboardLayout job that does the work.

Portions of the code are adapted from systemd-localed's source code,
which is under a compatible license (LGPLv2.1+, can be converted to our
GPLv3+ license). I ported it from C to to C++/Qt and made some minor
tweaks to the mapping logic (from X11 to vconsole layouts) though.

Fixes #31.

Tested on a Fedora Remix (Kannolo 21) with the default module settings
(finds the converted X11 keymaps for the virtual console) and with
convertedKeymapPath: "" (does the legacy keymap conversion as expected).

src/modules/keyboard/KeyboardPage.cpp

@@ -24,6 +24,7 @@
 
 #include "ui_KeyboardPage.h"
 #include "keyboardwidget/keyboardpreview.h"
+#include "SetKeyboardLayoutJob.h"
 
 #include "GlobalStorage.h"
 #include "JobQueue.h"
@@ -188,6 +189,22 @@ KeyboardPage::prettyStatus() const
 }
 
 
+QList< Calamares::job_ptr >
+KeyboardPage::createJobs()
+{
+    QList< Calamares::job_ptr > list;
+    QString selectedModel = m_models.value( ui->comboBoxModel->currentText(),
+                                            "pc105" );
+
+    Calamares::Job* j = new SetKeyboardLayoutJob( selectedModel,
+                                                  m_selectedLayout,
+                                                  m_selectedVariant );
+    list.append( Calamares::job_ptr( j ) );
+
+    return list;
+}
+
+
 void
 KeyboardPage::finalize()
 {