Add support for package base co-maintainers

This allows for having multiple co-maintainers for AUR packages.
Co-maintainers have push access to the package base Git repository but
are not allowed to change the package base category, disown the package
or modify the list of co-maintainers. The primary maintainer of an AUR
package can edit the list of co-maintainers from the Package Actions
box.

Implements FS#17911.

Signed-off-by: Lukas Fleischer <archlinux@cryptocrack.de>

web/html/index.php

@@ -78,6 +78,9 @@ if (!empty($tokens[1]) && '/' . $tokens[1] == get_pkg_route()) {
 			case "request":
 				include('pkgreq.php');
 				return;
+			case "comaintainers":
+				include('comaintainers.php');
+				return;
 			default:
 				header("HTTP/1.0 404 Not Found");
 				include "./404.php";