[Feature] Package Export/Import (#116)

Fixes #90
Fixes #91
Fixes #115
Fixes #104

Co-authored-by: Tim Lorsbach <tim@lorsba.ch>
Reviewed-on: enviPath/enviPy#116

epdb/management/commands/import_legacy_package.py

@@ -0,0 +1,27 @@
+from django.core.management.base import BaseCommand
+
+from epdb.logic import PackageManager
+from epdb.models import *
+
+
+class Command(BaseCommand):
+
+    def add_arguments(self, parser):
+        parser.add_argument(
+            '--data',
+            type=str,
+            help='Path of the Package to import.',
+            required=True,
+        )
+        parser.add_argument(
+            '--owner',
+            type=str,
+            help='Username of the desired Owner.',
+            required=True,
+        )
+
+    @transaction.atomic
+    def handle(self, *args, **options):
+        owner = User.objects.get(username=options['owner'])
+        package_data = json.load(open(options['data']))
+        PackageManager.import_legacy_package(package_data, owner)