change which to return rather than show
improve ability to use require from sysimg.jl
Document svd thin keyword argument and deprecate old versions.
Return vector for vector right hand side in least squares.
Add SharedArray utilities, expand documentation, add a few tests
Concretely specify the type of dims in SubArray

This allows the type of `size(S::SubArray)` to be inferred.
Merge pull request #5666 from JuliaLang/jn/sysimg_using

improve ability to use require from sysimg.jl
add UndefVarError type for undefined variable errors
use a convention for renamed variables to allow better reporting of the names of undefined variables. fixes #5692
Merge pull request #5646 from WestleyArgentum/which

change which to return rather than show
remove whicht, update doc for methods() and which()
One more relaxation of test bounds in linalg.
Merge pull request #5705 from mschauer/linalg

One more relaxation of test bounds in linalg.
Update base.rst
Merge pull request #5707 from mbauman/patch-1

Doc: repr uses showall, not show
Fix nfilled for AbstractArray, clarify docs, and add test
remove Scheduler
disable a test of source_path() which was invalidated by removing the Scheduler
restore parent task reference to Tasks
fix remaining issues from removing Scheduler