[FIX] base: remove the GWP currency

The Guinea-Bissau peso is no longer used since 1997.
The Republic of Guinea-Bissau is now using West African CFA franc (XOF)

openerp/addons/base/res/res_country_data.xml

@@ -654,7 +654,7 @@
             <field name="name">Guinea Bissau</field>
             <field name="code">gw</field>
             <field file="base/static/img/country_flags/gw.png" name="image" type="base64" />
-            <field name="currency_id" ref="GWP" />
+            <field name="currency_id" ref="XOF" />
             <field eval="245" name="phone_code" />
         </record>
         <record id="gy" model="res.country">

openerp/addons/base/res/res_currency_data.xml

@@ -594,12 +594,6 @@
             <field name="active" eval="False"/>
         </record>
 
-        <record id="GWP" model="res.currency">
-            <field name="name">GWP</field>
-            <field name="rounding">0.01</field>
-            <field name="active" eval="False"/>
-        </record>
-
         <record id="GYD" model="res.currency">
             <field name="name">GYD</field>
             <field name="symbol">$</field>

openerp/addons/base/res/res_currency_demo.xml

@@ -511,12 +511,6 @@
             <field name="rate">8835.85</field>
         </record>
 
-        <record forcecreate="0" id="rateGWP" model="res.currency.rate">
-            <field name="currency_id" ref="GWP" />
-            <field name="name">2010-01-01</field>
-            <field name="rate">659.30</field>
-        </record>
-
         <record forcecreate="0" id="rateGYD" model="res.currency.rate">
             <field name="currency_id" ref="GYD" />
             <field name="name">2010-01-01</field>