fix bug: rb.t$xxx
create x/m new html print API
add l(url), x.* use it for url params
add tree structure multi support
r add .is_null
sts/tag/multi/url use not utf8 header and reformat
r.is_null bugfix, add missing return false
sts.stack init/patch end/reverse order
tag add .d dummy
x.a support cut
k_http add .redirect, .gol

h.redirect use original url
h.gol use l(url)
tag.j tag.l must supply with <tag>
ReqBase refactor to sections
k_url use rdad for r.dad
allow customized ReqBase
support stander request parsing and nv-pairs
support customized before/after filter
MSID/BSID use c$XSID for transfer
demo src_b.pack to k_filter bugfix
remove uahash for request nv