Fix import errors

[chriskilding]

Fix the import errors that arose from the renaming of the modules.

Addresses #53

[ARobinsonAtTTC]

Damn though I had caught most of theses. Good catch.

[chriskilding]

I'm doing a single-tile build for +51+000 (i.e. the East London tile) to see how far I can get it through the process.

With a few more fixes I have got as far as

Step 3 : Building DSF/Imagery for tile <lat/long> : 
--------

-> Initializing providers with potential data on this tile.
-> Opening download queue.
-> Opening convert queue and 4 conversion workers.
-> Computing the pool quadtree
     Number of buckets: 67
     Average depth: 3.0597014925373136 , Average bucket size: 9543.223880597016
     Largest depth: 4

However it then fails with

  File "/Users/chris/Documents/Git/Ortho4XP/Ortho4XP/src/filenames.py", line 394, in jpeg_file_dir_from_attributes
    provider["code"] + "_" + str(zoomlevel),
KeyError: 'code'

The snippet of code around this point is:

def jpeg_file_dir_from_attributes(lat, lon, zoomlevel, provider):
    # ...
    elif provider["imagery_dir"] == "grouped":
        file_dir = os.path.join(
            Imagery_dir,
            long_latlon(lat, lon),
            provider["code"] + "_" + str(zoomlevel),     # the line where it fails
        )

The contents of the provider dictionary at that point are:

{
'grid_type': 'webmercator',
'directory': 'Global',
'in_GUI': True,
'image_type': 'jpeg',
'extent': 'global',
'color_filters': 'none',
'imagery_dir': 'grouped',
'request_type': 'tms',
'tile_size': 256,
'epsg_code': '3857',
'top_left_corner': [[-20037508.34, 20037508.34], [-20037508.34, 20037508.34], [-20037508.34, 20037508.34], [-20037508.34, 20037508.34], [-20037508.34, 20037508.34], [-20037508.34, 20037508.34], [-20037508.34, 20037508.34], [-20037508.34, 20037508.34], [-20037508.34, 20037508.34], [-20037508.34, 20037508.34], [-20037508.34, 20037508.34], [-20037508.34, 20037508.34], [-20037508.34, 20037508.34], [-20037508.34, 20037508.34], [-20037508.34, 20037508.34], [-20037508.34, 20037508.34], [-20037508.34, 20037508.34], [-20037508.34, 20037508.34], [-20037508.34, 20037508.34], [-20037508.34, 20037508.34], [-20037508.34, 20037508.34]],
'resolutions': array([1.56543034e+05, 7.82715170e+04, 3.91357585e+04, 1.95678792e+04,
       9.78393962e+03, 4.89196981e+03, 2.44598490e+03, 1.22299245e+03,
       6.11496226e+02, 3.05748113e+02, 1.52874057e+02, 7.64370283e+01,
       3.82185141e+01, 1.91092571e+01, 9.55462853e+00, 4.77731427e+00,
       2.38865713e+00, 1.19432857e+00, 5.97164283e-01, 2.98582142e-01,
       1.49291071e-01]),
'url_template': 'http://r{switch:0,1,2,3}.ortho.tiles.virtualearth.net/tiles/a{quadkey}.jpeg?g=136'
}

So, indeed, the code property is not present in the dictionary.