Implement logical indexing for SubArray. Fixes #4763
Add test for SubArray logical indexing
Simplify SubArray logical indexing test
Make SubArray logical indexing handle low-dimensional cases
Provides LAPACK.gesvx! wrapper

Includes simplified method for the no-equilibration, no-transpose calculation
Provides simplified LAPACK.gesvx! wrapper

Also changes warning of exact singularity to error.
Merge pull request #4594 from JuliaLang/cjh/gesvx

Provide linear solver with error estimates - wrap LAPACK.gesvx!
Fix generalized svdfact for unnecessary if/else statement
bump gmp 5.1.1 -> 5.1.3
Merge pull request #4764 from magistere/master

Implement logical indexing for SubArray. Fixes #4763