Bug 797204 - Qif import Tradable commodities page

This bug has two elements, the first is that when you have a large
number of tradable commodities you get an assistant page for each one
and if too many you loose site of the assistant buttons. To fix this a
notebook was added to the tradable commodities assistant page with the
individual commodities being added to notebook pages.

The second part was that when editing these an intrusive dialogue was
being raised that displayed the same information as the tooltip which
blocked input. These were removed and the assistant next button enabled
when all entries are valid.

gnucash/gtkbuilder/assistant-qif-import.glade

@@ -32,6 +32,9 @@
     <signal name="cancel" handler="gnc_ui_qif_import_cancel_cb" swapped="no"/>
     <signal name="close" handler="gnc_ui_qif_import_close_cb" swapped="no"/>
     <signal name="prepare" handler="gnc_ui_qif_import_prepare_cb" swapped="no"/>
+    <child>
+      <placeholder/>
+    </child>
     <child>
       <object class="GtkLabel" id="start_page">
         <property name="visible">True</property>
@@ -983,25 +986,78 @@ In the following page, you will see the text that appears in the Payee and Memo
       </packing>
     </child>
     <child>
-      <object class="GtkBox" id="commodity_doc_page">
+      <object class="GtkBox" id="commodity_page">
         <property name="visible">True</property>
         <property name="can_focus">False</property>
         <property name="border_width">12</property>
         <property name="orientation">vertical</property>
         <child>
-          <object class="GtkLabel" id="label833">
+          <object class="GtkBox">
             <property name="visible">True</property>
             <property name="can_focus">False</property>
-            <property name="label" translatable="yes">In the following pages you will be asked to provide information about stocks, mutual funds, and other investments that appear in the QIF file(s) you are importing. GnuCash needs some additional details about these investments that the QIF format does not provide. 
-
+            <property name="orientation">vertical</property>
+            <property name="spacing">6</property>
+            <child>
+              <object class="GtkLabel" id="label833">
+                <property name="visible">True</property>
+                <property name="can_focus">False</property>
+                <property name="margin_bottom">12</property>
+                <property name="label" translatable="yes">Below you are asked to provide information about stocks, mutual funds, and other investments that appear in the QIF file(s) you are importing. GnuCash needs some additional details about these investments that the QIF format does not provide. 
+
 Each stock, mutual fund, or other investment must have a name and an abbreviation, such as a stock symbol. Because some unrelated investments have the same abbreviation, you also need to indicate what type of abbreviation you have entered. For example, you could select the exchange that assigned the symbol (NASDAQ, NYSE, etc.), or select an investment type.
 
 If you don't see your exchange listed, or none of the available choices are appropriate, you can enter a new one.</property>
-            <property name="wrap">True</property>
+                <property name="wrap">True</property>
+              </object>
+              <packing>
+                <property name="expand">False</property>
+                <property name="fill">True</property>
+                <property name="position">0</property>
+              </packing>
+            </child>
+            <child>
+              <object class="GtkLabel" id="label834">
+                <property name="visible">True</property>
+                <property name="can_focus">False</property>
+                <property name="halign">start</property>
+                <property name="label" translatable="yes">Enter Information about...</property>
+              </object>
+              <packing>
+                <property name="expand">False</property>
+                <property name="fill">True</property>
+                <property name="position">1</property>
+              </packing>
+            </child>
+            <child>
+              <object class="GtkNotebook" id="commodity_notebook">
+                <property name="visible">True</property>
+                <property name="can_focus">True</property>
+                <property name="tab_pos">left</property>
+                <property name="scrollable">True</property>
+              </object>
+              <packing>
+                <property name="expand">True</property>
+                <property name="fill">True</property>
+                <property name="position">2</property>
+              </packing>
+            </child>
+            <child>
+              <object class="GtkLabel" id="label835">
+                <property name="visible">True</property>
+                <property name="can_focus">False</property>
+                <property name="halign">start</property>
+                <property name="label" translatable="yes">All fields must be complete to continue...</property>
+              </object>
+              <packing>
+                <property name="expand">False</property>
+                <property name="fill">True</property>
+                <property name="position">3</property>
+              </packing>
+            </child>
           </object>
           <packing>
-            <property name="expand">False</property>
-            <property name="fill">False</property>
+            <property name="expand">True</property>
+            <property name="fill">True</property>
             <property name="position">0</property>
           </packing>
         </child>