[Jbeta] boxed unicode

[Andrew Nikitin]

Hello,

Beta-o (and beta-n, if it matters) does not calculate right amount of 
horizontal bars to draw boxed unicode. I understand, there is still a 
problem with double-wide characters, but if box size was taken to be number 
of graphemes rather than number of bytes it would look right in most cases.

  's←(+/ω)÷ρω'
s←(+/ω)÷ρω
  <'s←(+/ω)÷ρω'
┌────────────────┐
│s←(+/ω)÷ρω│
└────────────────┘
  $7 u:'s←(+/ω)÷ρω'
10
  $'s←(+/ω)÷ρω'
16
  <7 u:'s←(+/ω)÷ρω'
┌────────────────┐
│s←(+/ω)÷ρω│
└────────────────┘
  <16$'-'
┌────────────────┐
│----------------│
└────────────────┘
  <10$'-'
┌──────────┐
│----------│
└──────────┘


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