Do not use socket_ok .. but readable  (as specified in precondition of read_stream_thread_aware
Added remove_header_named (a_name)
Moved more components from CMS to wsf_html.
This includes WSF_PAGER, and feature in WSF_THEME .. including WSF_API_OPTIONS
used to compute url and link.
allow to to set html attribute to the select widget
(useful to add code like  onchange="this.form.submit()")
fixed compilation