all plan pages now have date range form

rowers/templates/plannedsession_multicreate.html

@@ -8,6 +8,16 @@
 <h1>Create Sessions for {{ rower.user.first_name }} {{ rower.user.last_name }}</h1>
 
 <ul class="main-content">
+  <li>
+    <p>
+      <form enctype="multipart/form-data" method="get">
+        <table>
+          {{ dateform.as_table }}
+        </table>
+        <input type="Submit" value="Set Date Range">
+      </form>
+    </p>
+  </li>
   <li class="grid_4">
     <p>
       On this page, you can create and edit sessions for an entire time