Sliders option finalised with new ability to change the default position.
In actual usage this option was particularly useful so it makes a release by itself.

Bugfix for python vn3.10

Error handling improved for python3 when running with large image databases being worked on in parallel

Two minor bugfixes to image saving: images with chromacity property can be converted and dpi is preserved to the final image.

Updated to work with figures non pyplot figures (Issue #133)

Catches a bug that caused failures when sorting key names, by numeric sort, that included non-numeric elements starting with an 'E' or 'e'.

Databases can now be expanded if an image includes a tag name that is not in the database (previously these were ignored).

Bugfix to 0.7.6 rm_imt_images script to enable it to work in environments without the python2 to 3 compatibility modules installed.

Adds a bin directory containing a python script to delete images from disk and an image database in a consistent way.