Merge pull request #6273 from lindahua/dh/cov2

New implementation of cov/cor with extended API
repl: disable beep
repl: fix first-col edit_move_{up,down} bug
Restore method listing for foo(\t at REPL
fix #6310 (new repl can't read from pipe)
Merge pull request #6322 from JuliaLang/sjk/repl-methods

Restore method listing for foo(\t at REPL
fix warning about showerror during build
repl: add edit_delete_prev_word (fixes #6311)
Standardize and expose movement by word

Make all movement by word skip initial whitespace. Define and expose deletion by word to the right, as well.
fix #6323, fix #6314
fixed ``gemm`` and ``gemv`` in doc

now all fixed.
Merge pull request #6313 from GaZ3ll3/patch-1

duplicate gemm function in document
Merge pull request #6324 from mbauman/REPL-word-bindings2

Standardize and expose movements by word in the REPL
add missed export of Core.NewvarNode

a couple small updates
add precompiles for new REPL
partially fix using the repl on msys
Merge branch 'master' of https://github.com/JuliaLang/julia
uv_cwd API changed
fix cwd on unix (cherry-pick upstream bugfix)
fix #6312 (restore old repl history behavior)