pacman.conf: make ParallelDownloads configurable

config.py

@@ -37,6 +37,9 @@ CONFIG_DEFAULTS = {
         'git_repo': 'https://gitlab.com/kupfer/packages/pkgbuilds.git',
         'git_branch': 'dev',
     },
+    'pacman': {
+        'parallel_downloads': 4,
+    },
     'paths': {
         'cache_dir': CACHE_DIR,
         'chroots': os.path.join('%cache_dir%', 'chroots'),

distro.py

@@ -171,7 +171,7 @@ Color
 #NoProgressBar
 {'' if check_space else '#'}CheckSpace
 VerbosePkgLists
-ParallelDownloads = 8
+ParallelDownloads = {config.file['pacman']['parallel_downloads']}
 
 # By default, pacman accepts packages signed by keys that its local keyring
 # trusts (see pacman-key and its man page), as well as unsigned packages.