qt: general polish after adding new receive flow

- We no longer have an address book, but "address lists", update message
  accordingly
- Add tooltips here and there
- Clarify text on buttons
- add Copy Address button to receive request dialog

src/qt/forms/addressbookpage.ui

@@ -11,7 +11,7 @@
    </rect>
   </property>
   <property name="windowTitle">
-   <string></string>
+   <string/>
   </property>
   <layout class="QVBoxLayout" name="verticalLayout">
    <item>
@@ -60,7 +60,7 @@
         <string>Create a new address</string>
        </property>
        <property name="text">
-        <string>&amp;New Address</string>
+        <string>&amp;New</string>
        </property>
        <property name="icon">
         <iconset resource="../bitcoin.qrc">
@@ -74,7 +74,7 @@
         <string>Copy the currently selected address to the system clipboard</string>
        </property>
        <property name="text">
-        <string>&amp;Copy Address</string>
+        <string>&amp;Copy</string>
        </property>
        <property name="icon">
         <iconset resource="../bitcoin.qrc">
@@ -124,15 +124,9 @@
       </widget>
      </item>
      <item>
-      <widget class="QDialogButtonBox" name="buttonBox">
-       <property name="sizePolicy">
-        <sizepolicy hsizetype="Maximum" vsizetype="Fixed">
-         <horstretch>0</horstretch>
-         <verstretch>0</verstretch>
-        </sizepolicy>
-       </property>
-       <property name="standardButtons">
-        <set>QDialogButtonBox::Ok</set>
+      <widget class="QPushButton" name="closeButton">
+       <property name="text">
+        <string>C&amp;lose</string>
        </property>
       </widget>
      </item>