* lisp/progmodes/project.el (project-vc-dir, project-shell): New commands.
(project-compile): Add args and interactive spec like in 'compile'. (project-switch-commands): Bind project-vc-dir to "v", project-shell to "s", and rebind project-find-regexp from "s" to "r". * doc/emacs/maintaining.texi (Project File Commands): Describe project-vc-dir and project-shell.