Compat and updates for 0.7

[mforets]

Now i get:

julia> using CDDLib
[ Info: Precompiling CDDLib [3391f64e-dcde-5f30-b752-e11513730f60]
ERROR: LoadError: LoadError: TypeError: in Type{...} expression, expected UnionAll, got Type{Union{Int64, Size}}
Stacktrace:
 [1] top-level scope at none:0
 [2] include at ./boot.jl:317 [inlined]
 [3] include_relative(::Module, ::String) at ./loading.jl:1038
 [4] include at ./sysimg.jl:29 [inlined]
 [5] include(::String) at /Users/forets/.julia/dev/CDDLib/src/CDDLib.jl:3
 [6] top-level scope at none:0
 [7] include at ./boot.jl:317 [inlined]
 [8] include_relative(::Module, ::String) at ./loading.jl:1038
 [9] include(::Module, ::String) at ./sysimg.jl:29
 [10] top-level scope at none:2
 [11] eval at ./boot.jl:319 [inlined]
 [12] eval(::Expr) at ./client.jl:399
 [13] top-level scope at ./none:3
in expression starting at /Users/forets/.julia/dev/CDDLib/src/matrix.jl:79
in expression starting at /Users/forets/.julia/dev/CDDLib/src/CDDLib.jl:51
ERROR: Failed to precompile CDDLib [3391f64e-dcde-5f30-b752-e11513730f60] to /Users/forets/.julia/compiled/v0.7/CDDLib/SMSjF.ji.
Stacktrace:
 [1] error(::String) at ./error.jl:33
 [2] macro expansion at ./logging.jl:313 [inlined]
 [3] compilecache(::Base.PkgId, ::String) at ./loading.jl:1185
 [4] _require(::Base.PkgId) at ./logging.jl:311
 [5] require(::Base.PkgId) at ./loading.jl:852
 [6] macro expansion at ./logging.jl:311 [inlined]
 [7] require(::Module, ::Symbol) at ./loading.jl:834

[coveralls]

Coverage remained the same at 87.464% when pulling 9481e80 on mforets:mforets/updates_0.7 into c5c3633 on JuliaPolyhedra:master.

[codecov]

Codecov Report

Merging #29 into master will not change coverage.
The diff coverage is 88.88%.

@@           Coverage Diff           @@
##           master      #29   +/-   ##
=======================================
  Coverage   87.46%   87.46%           
=======================================
  Files          10       10           
  Lines         694      694           
=======================================
  Hits          607      607           
  Misses         87       87

Impacted Files	Coverage Δ
src/polyhedra.jl	96.77% <100%> (ø)	⬆️
src/CDDLib.jl	100% <100%> (ø)	⬆️
src/lp.jl	97.33% <100%> (ø)	⬆️
src/matrix.jl	97.61% <100%> (ø)	⬆️
src/mytype.jl	63.63% <72.72%> (ø)	⬆️
src/settype.jl	68% <75%> (ø)	⬆️

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[mforets]

I can see that the issue is related to the removal of the type parameter N in Polyhedra, such as

function initmatrix(d::Polyhedra.FullDim, ::Type{T}, inequality::Bool, itr::Polyhedra.ElemIt...) where T
    n = d+1
    ...
end

...
mutable struct CDDInequalityMatrix{T <: PolyType, S <: MyType} <: Polyhedra.MixedHRep{T}
...

But i was confused in other places for the required updates in matrix.jl, as in _length(matrix, N), sorry :/

[blegat]

Polyhedra has dropped Julia v0.6 so there is no need to try to support it here