utf8 nchar db output http utf-8 will not convert
if http req cs = db char or db nchar, do not conv
g.feedback(false) support
add r.req_charset_ndb, support parse nchar params
g.feedback(false) support 2, init to null
feedback cookie clear can be simple
add varchar2 buffer support, avoid cs convertion
db cs output bugfix
h.use_bom to output bom at start of response body
cs convertable test bugfix