remove dummy code in ColPivHouseholderQR::solve
Fix SparseLU special gemm kernel on 32 bits system w/o SSE
Workaround "error: floating-point literal cannot appear in a constant-expression" in mpreal.h when compiling with predantic.
(I really don't know how to properly fix this))
Specialize GEBP traits and kernel for mpreal to by-pass mpreal and remove the costly creation of many temporaries.
Relax a bit the precision in mpreal unit test.