Modified sage-install-dont-bytecompile-files.
Merge remote-tracking branch 'refs/remotes/origin/master' into origin-alpha
Merge branch 'master' into origin-alpha
Merge branch 'master' into origin-alpha
Added sage-shell:interrupt-subjob.
Added sage-shell:change-mode-line-process.
Modfied sage-shell:change-mode-line-process.
Do not execute sage-shell-ac:init unless output finished.