Add generalized repmat function as repeat
Document repeat function

Extend ind2sub and sub2ind to accept a reusable array of indices
Expose rem1 and fld1, defined by analogy with mod1
Restore basic ind2sub definition
Fix #2815
change string indexing to avoid invalid indexes in more cases, and
eliminate the thisind() function

For example, search("∀ x", "∀", 1) used to give 1:3, which doesn't
make much sense since the "3" is an artifact of the encoding and isn't
a valid index. Now it gives 1:1, or in general a:b where a is the index
of the first found character and b is the index of the last found character.
Fix a stack alignment issue
Make sure core dumps are still generated

This removes the non-stack-overflow segfault handler. An improved
version will be added later. But that is a separate change
Let least squares solver return zeros instead of throwing an error when left hand side is zero
Fix #3790
Add vectorized iround(T, x)
Sorting: proper API documentation.
Eliminate need to `make -C deps install-atlas`, only need to `make -C deps compile-atlas` now.
Merge pull request #3802 from staticfloat/atlasfix

Eliminate need to `make -C deps install-atlas`
bytestring should take any integer length, not just Int
sorting: add some missing deprecations (yes, more).
Merge pull request #3769 from JuliaLang/kf/macunwind

RFC: Catch all stack overflows on mac.
Don't allow ByteStrings to be repeated a negative number of times. (Fixes #3806)
Pkg2: clarify message when cloning the cache of a package repo.
fix #3806: don't allow Array(Uint8,-1)
Raytracer benchmark