Quoted shown expressions
Test for access to undefined error from splice!
Use deleteat! instead of splice! in linalg/sparse

If the array type is such that elements are initially allocated as #undef, then splice! will fail to remove the extra space since it returns the values, giving error: access to undefined reference.
Test sparse diff
Fix logic error in sparse diff

Fixes #5853
use wchar_t for argument to wcwidth on linux. probably fixes #5854
Merge pull request #5855 from tkelman/sparse-diff

Fix logic error in sparse diff
Merge pull request #5850 from Calder/deparse

Quote shown expressions
Merge branch 'sparse-deleteat' of github.com:tkelman/julia into tkelman-sparse-deleteat

Conflicts:
	test/sparse.jl
we aren't being consistent in separating 'new library functions' from 'library improvements'; NEWS for #3344
don't print slice indexes for array show/repr
Merge branch 'master' of github.com:JuliaLang/julia into jb/arrayrepr