Allow profile description customization

When opening the profile editor, the description field is populated but
is marked ReadOnly for some reason; all the back-end code existed to
make this read-write (except in the case when the profile lacks a
description, see the comment in TailoringWindow::setProfileDescription
and TailoringWindow::setProfileTitle).

This makes the field read-write.

Note that the behavior is less than ideal: <xccdf:description /> can
include HTML content, and while this is a HTML-aware editor, hitting the
return key inserts merely a '\n' into the text stream and not a <br />
(or better, <xhtml:br /> with XML-NS awareness) element.

Perhaps this behavior should be corrected at the openscap library level,
detecting the HTML XML namespace applied on the <xccdf:description />
element and namespacing the input correctly?

Signed-off-by: Alexander Scheel <alex.scheel@canonical.com>

Author: cipherboy

ui/ProfilePropertiesDockWidget.ui

@@ -21,7 +21,16 @@
   </property>
   <widget class="QWidget" name="dockWidgetContents">
    <layout class="QVBoxLayout" name="verticalLayout">
-    <property name="margin">
+    <property name="leftMargin">
+     <number>0</number>
+    </property>
+    <property name="topMargin">
+     <number>0</number>
+    </property>
+    <property name="rightMargin">
+     <number>0</number>
+    </property>
+    <property name="bottomMargin">
      <number>0</number>
     </property>
     <item>
@@ -34,8 +43,8 @@
         <rect>
          <x>0</x>
          <y>0</y>
-         <width>388</width>
-         <height>304</height>
+         <width>398</width>
+         <height>314</height>
         </rect>
        </property>
        <layout class="QGridLayout" name="gridLayout">
@@ -57,7 +66,7 @@
            <bool>false</bool>
           </property>
           <property name="readOnly">
-           <bool>true</bool>
+           <bool>false</bool>
           </property>
          </widget>
         </item>