Type piracy breaking incremental compilation

[jonschumacher]

using MPIReco gives the following output:

WARNING: Method definition has_args5(LinearOperators.opEye) in module SparsityOperators at /home/schumacherj/.julia/packages/SparsityOperators/uMtMk/src/SparsityOperators.jl:18 overwritten in module LinearOperatorCollection at /home/schumacherj/.julia/packages/LinearOperatorCollection/SvtgC/src/LinearOperatorCollection.jl:16.
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition use_prod5!(LinearOperators.opEye) in module SparsityOperators at /home/schumacherj/.julia/packages/SparsityOperators/uMtMk/src/SparsityOperators.jl:17 overwritten in module LinearOperatorCollection at /home/schumacherj/.julia/packages/LinearOperatorCollection/SvtgC/src/LinearOperatorCollection.jl:15.
  ** incremental compilation may be fatally broken for this module **

This happens due to both LinearOperatorCollection (used in MPIFiles) and SparsityOperators (used in RegularizedLeastSquares) both defining

LinearOperators.use_prod5!(op::opEye) = false
LinearOperators.has_args5(op::opEye) = false

in their main files, which is a type piracy (https://github.com/JuliaImageRecon/LinearOperatorCollection.jl/blob/5d2fe7d9d70e1badb57dd74aced22355beb423ee/src/LinearOperatorCollection.jl#L14C1-L16C45 und https://github.com/JuliaImageRecon/LinearOperatorCollection.jl/blob/5d2fe7d9d70e1badb57dd74aced22355beb423ee/src/LinearOperatorCollection.jl#L15C1-L16C45).

Since I am not sure why these methods are definied in the respective packages, I can only leave this issue here and can't provide a PR.

[tknopp]

MPIReco ist currently broken because of the recent MPIFiles releases. @nHackel ist currently working in a fix, which ist already on a branch and needs backporting.

[jonschumacher]

Seems to work again. I will close here.