Some error message cleanup to fix segfault when transposing sparse vector with illegal values.
remove use of callback API in REPL
Merge pull request #5191 from JuliaLang/anj/fixsparse

Some error message cleanup to fix segfault when transposing sparse vector with illegal values.
Merge branch 'master' of github.com:JuliaLang/julia
specialized abs2 for bool
Merge pull request #5211 from lindahua/dh/abs2bool

specialized abs2 for bool