rolling back part of the change in SmartTokenLabs#388

as we couldn't get the validator to work with the new <assert> statement
documented here
SmartTokenLabs#395

schema/tokenscript.xsd

@@ -52,8 +52,10 @@
             </sequence>
             <attribute name="custodian" type="boolean" default="false"/>
             <attribute name="name" type="NCName"/>
+	    <!-- commented out thanks to issue 
       		<assert test="count(ts:attribute[string(@distinct) = 'true']) le 1"/>
 			<assert test="if(not(ts:origins)) then count(ts:attribute[string(@distinct) = 'true']) = 1 else true()"/>
+	    -->
         </complexType>
         <keyref name="typeRef" refer="ts:namedTypeName">
             <selector xpath=".//ts:origins/ethereum:event|.//ts:origins/ethereum:call"></selector>