reworked cluster manager interface
Apply custom keymaps to all prompt modes and document it.
Remove superfluous semicolons
Only run stringreplace if we need to.

Closes #8482
Add mention of Fedora/EPEL in README.md
Don't rebuild stringreplace so often
Merge pull request #8306 from amitmurthy/amitm/slowstart

RFC: reworked cluster manager interface
rename `cman` to `manager` and other cleanup in multi.jl, mostly formatting
Merge pull request #8476 from eschnett/iobuffer-semicolons

Remove superfluous semicolons in iobuffer.jl
Remove debugging echo
Merge pull request #8489 from nalimilan/Fedora

Add mention of Fedora/EPEL in README.md
Merge pull request #8439 from blakejohnson/repl-doc

Apply custom keymaps to all prompt modes and document it.
Minor rework of parallel launch. Added documentation.
Merge pull request #8495 from amitmurthy/amitm/launch_chkerror

Minor rework of parallel launch. Added documentation.
Merge pull request #8490 from eschnett/Makefile-stringreplace

Don't rebuild stringreplace so often
doc formatting fix
Merge pull request #8503 from amitmurthy/amitm/docfix

doc formatting fix
Fix 8506: randi -> rand(1:n)
Merge branch 'master' of github.com:JuliaLang/julia into jb/checked_int_trunc