PICARD-1602: Minimize files included in sdist

MANIFEST.in

@@ -1,55 +1,13 @@
 graft po
+prune test
 
 recursive-include scripts *.in
-
-graft ui
-recursive-include resources *.py
-
-recursive-include test *.py
-recursive-include test/data *.aac
-recursive-include test/data *.aiff
-recursive-include test/data *.ape
-recursive-include test/data *.asf
-recursive-include test/data *.dat
-recursive-include test/data *.dsf
-recursive-include test/data *.flac
-recursive-include test/data *.gif
-recursive-include test/data *.ini
-recursive-include test/data *.jpg
-recursive-include test/data *.json
-recursive-include test/data *.m4a
-recursive-include test/data *.m4v
-recursive-include test/data *.mid
-recursive-include test/data *.mp3
-recursive-include test/data *.mpc
-recursive-include test/data *.ofr
-recursive-include test/data *.ofs
-recursive-include test/data *.oga
-recursive-include test/data *.ogg
-recursive-include test/data *.ogv
-recursive-include test/data *.opus
-recursive-include test/data *.png
-recursive-include test/data *.spx
-recursive-include test/data *.tak
-recursive-include test/data *.tta
-recursive-include test/data *.wav
-recursive-include test/data *.wma
-recursive-include test/data *.wmv
-recursive-include test/data *.wv
-recursive-include test/data/testplugins *.zip
+recursive-exclude scripts picard
 
 include tagger.py
 include *.in
 
 include *.md
 include *.txt
 
-recursive-include resources org.musicbrainz.Picard.svg
-recursive-include resources/images org.musicbrainz.Picard.png
-
-recursive-include installer *.in
-recursive-include installer *.ini
-recursive-include installer/images *.bmp
-recursive-include installer/images *.ico
-recursive-include installer/images *.svg
-recursive-include installer/languages *.nsh
+exclude org.musicbrainz.Picard.appdata.xml

setup.py

@@ -223,7 +223,8 @@ def run(self):
             args['name'] = 'MusicBrainz Picard'
             file_version = PICARD_VERSION[0:3] + PICARD_VERSION[4:]
             args['file_version'] = '.'.join([str(v) for v in file_version])
-            generate_file('installer/picard-setup.nsi.in', 'installer/picard-setup.nsi', args)
+            if os.path.isfile('installer/picard-setup.nsi.in'):
+                generate_file('installer/picard-setup.nsi.in', 'installer/picard-setup.nsi', args)
             version_args = {
                 'filevers': str(file_version),
                 'prodvers': str(file_version),