mkpkglists improvements

This overlaid MR changes a couple things, namely the format of the meta package archive and only updating archives when needed.

Update When Needed:

We now use the information_schema.tables AUTO_INCREMENT column to keep track of a "serial number" that can be used to tell us whether we need to update or not.

Metadata Format:

    The SQL logic in this file for package metadata now exactly
    reflects RPC's search logic, without searching for specific
    packages.

    Two command line arguments are available:

        --extended | Include License, Keywords and Groups fields

    When one of these arguments are passed, the script will create
    a packages-meta-ext-v1.json.gz, configured via packagesmetaextfile.

    Archive JSON is in the following format: line-separated package objects
    enclosed in a list:

        [
        {...},
        {...},
        {...}
        ]

    This allows users to stream the archive and process packages
    line-by-line, during the local storage process.

    Signed-off-by: Kevin Morris <kevr@0cost.org>

web/html/index.php

@@ -190,6 +190,7 @@ if (!empty($tokens[1]) && '/' . $tokens[1] == get_pkg_route()) {
 		break;
 	case "/packages.gz":
 	case "/packages-meta-v1.json.gz":
+	case "/packages-meta-ext-v1.json.gz":
 	case "/pkgbase.gz":
 	case "/users.gz":
 		header("Content-Type: text/plain");