hgview #109863 advertise the heavy file threshold option [validation pending]

We have a wonderful option. The message that informs that a file is too big should advertise this option. (and the global state)

prioritynormal
typebug
done in1.8.0
load0.750
load left0.000
closed by#bbe663f29703 [qt4] display "maxfilesize" config entry on big file
patch[qt4] display "maxfilesize" config entry on big file [folded][qt4] display "maxfilesize" config entry on big file [applied][qt4] display "maxfilesize" config entry on big file (closes #109863) [rejected][qt4] display "maxfilesize" config entry on big file (closes #109863) [rejected][qt4] display "maxfilesize" config entry on big file (closes #109863) [rejected][qt4] display "maxfilesize" config entry on big file (closes #109863) [rejected]