use absolute imports everywhere

src/c3nav/mapdata/packageio/const.py

@@ -1,3 +1,3 @@
-from ..models import Feature, Level, Package, Source
+from c3nav.mapdata.models import Feature, Level, Package, Source
 
 ordered_models = (Package, Level, Source, Feature)

src/c3nav/mapdata/packageio/read.py

@@ -6,8 +6,8 @@ import subprocess
 from django.conf import settings
 from django.core.management import CommandError
 
-from ..models import Level, Package
-from .const import ordered_models
+from c3nav.mapdata.models import Level, Package
+from c3nav.mapdata.packageio.const import ordered_models
 
 
 class MapdataReader:

src/c3nav/mapdata/packageio/write.py

@@ -7,11 +7,10 @@ from datetime import datetime
 from django.conf import settings
 from django.utils import timezone
 
+from c3nav.mapdata.models import Package
+from c3nav.mapdata.packageio.const import ordered_models
 from c3nav.mapdata.utils import json_encoder_reindent
 
-from ..models import Package
-from .const import ordered_models
-
 
 class MapdataWriter:
     def __init__(self):