More compact BigFloat Matrix printing?

[jakebolewski]

I feel we are displaying too much information when printing BigFloat matrix elements.

julia> A = rand(1:10, (5,5))
5x5 Array{Int64,2}:
 4  7   1  10   7
 6  1   1   9   1
 2  7  10   4   3
 4  7   5   2  10
 2  2   8   7  10

julia> BA = convert(Matrix{BigFloat}, A)
5x5 Array{Base.MPFR.BigFloat,2}:
 4e+00  7e+00  1e+00  1e+01  7e+00
 6e+00  1e+00  1e+00  9e+00  1e+00
 2e+00  7e+00  1e+01  4e+00  3e+00
 4e+00  7e+00  5e+00  2e+00  1e+01
 2e+00  2e+00  8e+00  7e+00  1e+01

julia> inv(BA)
5x5 Array{Base.MPFR.BigFloat,2}:
 -1.380383580080753701211305518169582772543741588156123822341857335127860026917896e-01  …  -7.231381785554060116644235082996859578286227007626738447734410049349484073575448e-02
  9.707267833109017496635262449528936742934051144010767160161507402422611036339083e-02     -9.763346792283535217586361597128757290264692687303723642889187976671152983400595e-02
 -7.856662180349932705248990578734858681022880215343203230148048452220726783310781e-02      4.435845670704351727231942575145805293853746074472857783759533423059668012561633e-02
  8.899730820995962314939434724091520861372812920592193808882907133243606998654184e-02      4.682593091072229699416778824585015702108568864961866307761327949753252579632052e-02
  8.748317631224764468371467025572005383580080753701211305518169582772543741587301e-03      6.572454015253476895468820098698968147151188873934499775684163301929116195603509e-02

[jiahao]

Related: JuliaLang/julia#29

[KristofferC]

julia> inv(BA)
5×5 Array{BigFloat,2}:
  1.04779e-01  -7.48422e-02  -8.74156e-02   1.89419e-02   5.01851e-02
 -1.10494e-02   7.89245e-03   1.29218e-01  -5.29066e-02   9.25321e-03
 -5.17091e-03   2.89408e-01   9.00283e-02  -2.71065e-01  -1.0897e-01
 -8.15371e-02   5.82408e-02  -1.19747e-02  -1.11039e-02   1.02765e-01
  4.20205e-02  -1.72872e-01  -5.79142e-02   2.55389e-01  -3.02634e-02