[IMP] sale,purchase: harmonize address layout in qweb reports

Shipping and invoice addresses header are now bold and sticked to the related
address.

addons/purchase/views/report_purchaseorder.xml

@@ -7,7 +7,7 @@
             <div class="oe_structure"/>
             <div class="row">
                 <div class="col-xs-6">
-                    Shipping address :<br/>
+                    <strong>Shipping address:</strong>
                     <div t-if="o.dest_address_id">
                         <div t-field="o.dest_address_id"
                             t-field-options='{"widget": "contact", "fields": ["address", "name", "phone", "fax"], "no_marker": true}'/>

addons/purchase/views/report_purchasequotation.xml

@@ -8,7 +8,7 @@
 
             <div class="row mt32 mb32">
                 <div class="col-xs-6">
-                    Shipping address :<br/>
+                    <strong>Shipping address:</strong>
                     <div t-if="o.dest_address_id">
                         <div t-field="o.dest_address_id"
                             t-field-options='{"widget": "contact", "fields": ["address", "name", "phone", "fax"], "no_marker": true}'/>

addons/sale/views/report_saleorder.xml

@@ -7,13 +7,13 @@
             <div class="oe_structure"/>
             <div class="row">
                 <div class="col-xs-6">
-                    <p t-if="o.partner_shipping_id == o.partner_invoice_id">Invoice and shipping address:</p>
-                    <p t-if="o.partner_shipping_id != o.partner_invoice_id">Invoice address: </p>
+                    <strong t-if="o.partner_shipping_id == o.partner_invoice_id">Invoice and shipping address:</strong>
+                    <strong t-if="o.partner_shipping_id != o.partner_invoice_id">Invoice address:</strong>
                     <div t-field="o.partner_invoice_id" 
                         t-field-options='{"widget": "contact", "fields": ["address", "name", "phone", "fax"], "no_marker": true}'/>
                     <p t-if="o.partner_id.vat">VAT: <span t-field="o.partner_id.vat"/></p>
-                    <div t-if="o.partner_shipping_id != o.partner_invoice_id">
-                        <p>Shipping address :</p>
+                    <div t-if="o.partner_shipping_id != o.partner_invoice_id" class="mt8">
+                        <strong>Shipping address:</strong>
                         <div t-field="o.partner_shipping_id" 
                             t-field-options='{"widget": "contact", "fields": ["address", "name", "phone", "fax"], "no_marker": true}'/>
                         <p t-if="o.partner_id.vat">VAT: <span t-field="o.partner_id.vat"/></p>