summary: Remove reset button

This has been broken for years.  I don't object to fixing it, it's just that
I have better things to do right now and we've gotten complaints about it;
no use in keeping around something that's broken if there's no desire to fix
it.  Workaround: refresh the page.

This does keep around the reset logic because it is actually used in other
places.

* src/current/include/entry-form.xsl (entry-form)[lv:package]: Remove reset
    button.
* src/current/include/entry-form.js (clearTestCases): Remove broken function
    call `Prior.setPriorMessage(null)'.

src/current/include/entry-form.xsl

@@ -57,7 +57,6 @@
 
       <div>
         <input type="submit" value="Calculate Premium" />
-        <input type="reset" value="Reset" />
       </div>
 
       <div class="final-premium"></div>

src/current/scripts/entry-form.js

@@ -167,9 +167,6 @@ var client = ( function()
         save_id      = '';
         prior_result = undefined;
 
-        // clear prior message
-        Prior.setPriorMessage( null );
-
         // clear prior class from body
         document.body.className = document.body.className.replace(
             /\bprior\b/, ''