ui: anchors typo fix
introducing requestformfield as parameters overriding mechanism

rest and web ui now support overriding task parameters at request time

in config:
  (requestform
    (field (param begin) # internal and ui field identifier
      (label First day) # display
      (placeholder yyyy-mm-dd) # ui placeholder
      (format "2[0-9]{3}-[0-9]{2}-[0-9]{2}") # server-side regexp
      (appendcommand --start %begin)
      (setenv START %begin)
    )
    (field (param end)
      (label Last day)
      (placeholder "yyyy-mm-dd (default: = first day)")
      (format "2[0-9]{3}-[0-9]{2}-[0-9]{2}")
      (appendcommand --end %end)
      (setenv END %end)
    )
    (field (param dryrun)
      (label Dry run)
      (suggestion false) # default value in ui form
      (format "true|false")
      (appendcommand --dryrun %dryrun)
    )
  )
ui: adding last return code on task views
ui: introducing taskdoc.html automatic doc of task

/console/taskdoc.html?fqtn=foo is the doc page of task foo