Remove Rmath from deps/ to prepare for a submodule
Add Rmath submodule
Update deps/Makefile for the Rmath submodule
Try adding Rmath submodule again.
Fix the LIBRANDOM_PATH for building Rmath.
Merge pull request #2175 from JuliaLang/vs/rmath

RFC: Move Rmath to its own repo
Reintroduce librandom dependency on Rmath
Don't unconditionally install glpk, respect USE_SYSTEM_GLPK
Merge pull request #2182 from staticfloat/glpkfix

Don't unconditionally install glpk, respect USE_SYSTEM_GLPK
Merge pull request #2181 from staticfloat/rmathfix

Reintroduce librandom dependency on Rmath
deprecated.jl: further improvements to errors for removed functions.
Set paramater order on sort-related routines so that the vector being
sorted/searched/etc. is always first.
Fix order of nans2end.
Allow function arguments as first paramter of sort functions
Sort updates:

* Add sort versions which take Functions as first argument,
  for use with "sort(x) do a..." syntax
* Added (but commented out) select and selectby functions
  for same.