add DATAROOTDIR to build_h.jl, use it in Base.runtests()
added built-in exception UndefVarError to manual
Merge pull request #8386 from davidssmith/man

added built-in exception UndefVarError to manual
close #8304, tweak openblas build troubleshooting

this is a bit redundant, but it definitely belongs under the category of openblas build failure
Bump libosxunwind to 0.0.1. (RC3 was marked as release).
move default setting of prefix to Make.inc,

change SYSCONFDIR and DATAROOTDIR to be relative paths
Stylistic change

See https://github.com/JuliaLang/julia/pull/8323#discussion_r17609618
fix eigfact doc
splice!: allow replacement argument to be anything enumerable.

This is a good example of scalars being iterable being a good thing.

cc: @carlobaldassi – splice! for BitArrays should also be generalized
but I was finding it tricky to figure out the best way to do so.
Merge pull request #8391 from rfourquet/docs-linalg

fix eigfact doc
Merge pull request #8379 from JuliaLang/tk/datarootdir

add DATAROOTDIR to build_h.jl, use it in Base.runtests()