allow to set user name which will be visible in the interface

pboard/pboard/controllers/apipublic.py

 class PODPublicApiController(plb.BaseController):
 
     @tg.expose()
-    def create_account(self, email='', password='', retyped_password='', **kw):
+    def create_account(self, email='', password='', retyped_password='', real_name='', **kw):
       if email=='' or password=='' or retyped_password=='':
         tg.flash(_('Account creation error: please fill all the fields'), 'error')
         tg.redirect(tg.lurl('/'))
 
         loNewAccount = pld.PODStaticController.createUser()
         loNewAccount.email_address = email
-        loNewAccount.display_name  = email
+        loNewAccount.display_name  = real_name if real_name!='' else email
         loNewAccount.password      = password
 
         loUserGroup = pld.PODStaticController.getGroup('user')

pboard/pboard/templates/pod.mak

     <form class="well" method="POST" style="min-height: ${psCssMinHeight};" action="${tg.url('/public_api/create_account')}">
       <fieldset>
         <legend>${_('Create an account')}</legend>
+        <input type="text"     name="real_name"        id="real_name" placeholder="Name"><br/>
         <input type="text"     name="email"            id="email" placeholder="Email"><br/>
         <input type="password" name="password"         id="password" placeholder="Password"><br/>
         <input type="password" name="retyped_password" id="retyped_password" placeholder="Retype your password"><br/>