update pacman.conf to upstream defaults

pacman-default.conf

@@ -35,7 +35,7 @@ ILoveCandy
 #NoProgressBar
 CheckSpace
 VerbosePkgLists
-#ParallelDownloads = 5
+ParallelDownloads = 5
 DownloadUser = alpm
 #DisableSandbox
 
@@ -44,3 +44,30 @@ DownloadUser = alpm
 SigLevel    = Required DatabaseOptional
 LocalFileSigLevel = Optional
 #RemoteFileSigLevel = Required
+
+# NOTE: You must run `pacman-key --init` before first using pacman; the local
+# keyring can then be populated with the keys of all official Arch Linux
+# packagers with `pacman-key --populate archlinux`.
+
+#
+# REPOSITORIES
+#   - can be defined here or included from another file
+#   - pacman will search repositories in the order defined here
+#   - local/custom mirrors can be added here or in separate files
+#   - repositories listed first will take precedence when packages
+#     have identical names, regardless of version number
+#   - URLs will have $repo replaced by the name of the current repo
+#   - URLs will have $arch replaced by the name of the architecture
+#
+# Repository entries are of the format:
+#       [repo-name]
+#       Server = ServerName
+#       Include = IncludePath
+#
+# The header [repo-name] is crucial - it must be present and
+# uncommented to enable the repo.
+#
+
+# The testing repositories are disabled by default. To enable, uncomment the
+# repo name header and Include lines. You can add preferred servers immediately
+# after the header, and they will be used before the default mirrors.