fixing up openslide reader'
Reading image data from OpenslideReader
Pyramid uploader runnign with openslide, not ready
Option to re-upload an image

- option --overwrite
- removes the image from the image store (both image record and collection)
Going from thread to multiprocess
choosing the reader in uploader
Bugfix for remove image from imagestore
First working implementation
Elegant way to launch processes
fix: Inserting all tiles
Fixed common_utils for good
Wokring uploader for PilReader (inverted y axis)
Enhancement move the padding logic to the reader

Thus reader knows completely to create multires tiles
fix for infinite recursion
Moving get_tile routing to higher up in the hierarchy

(InvertedReader class)
Uploader working for svs, scn, ndpi

- Using 16 threads
- Builds integrated pyramids
- completes the pil and openslide readers