Use relative symlinks for single color tiles
Use relative symlinks for single color tiles

Using a relative link allows the cache to be portable even when the
option to link single color tiles is used.

olt/mapproxy,faegi/mapproxy,drnextgis/mapproxy,Anderson0026/mapproxy,olt/mapproxy,geoadmin/mapproxy,faegi/mapproxy,kaiCu/mapproxy,vrsource/mapproxy,kaiCu/mapproxy,procrastinatio/mapproxy,procrastinatio/mapproxy,camptocamp/mapproxy,camptocamp/mapproxy,mapproxy/mapproxy,mapproxy/mapproxy,Anderson0026/mapproxy,drnextgis/mapproxy,geoadmin/mapproxy,vrsource/mapproxy