change which to return rather than show
improve ability to use require from sysimg.jl
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
since jl_task_t->last can now be null (if the thread hasn't started), let the gc know