pep_aux.lib, pubsub_aux.lib: fix uncompliance with XML Schema Part 2: Datatypes, (Fixes #37)
<<the allowable lexical representations for the xs:boolean datatype are the
strings "0" and "false" for the concept 'false' and the strings "1" and "true"
for the concept 'true'; implementations MUST support both styles of lexical
representation.>>