WIP: Refactoring of printing to re-use more code between IJulia and REPL

[IainNZ]

Refactors the printing code to hopefully clean it up, simplify it, improve (true) coverage, and make IJulia support consistent.

[IainNZ]

Help:

using JuMP
@show JuMP.repl_leq
m = Model()
@defVar(m, x, Bin)
solve(m)
@show JuMP.repl_leq

JuMP.repl_leq => "≤"
Optimize a model with 0 rows, 1 columns and 0 nonzeros
Found heuristic solution: objective 0
Presolve removed 0 rows and 1 columns
Presolve time: 0.00s

Explored 0 nodes (0 simplex iterations) in 0.00 seconds
Thread count was 1 (of 8 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 0.000000000000e+00, best bound 0.000000000000e+00, gap 0.0%
JuMP.repl_leq => "\u2264"

I don't get why it changes - no printing code seems to be touched...

[joehuchette]

Did you change operating systems during optimization o_O

[coveralls]

Coverage decreased (-1.01%) when pulling 204d298 on cleanerprint into c7418d3 on master.