javascript preloads images needed for the animator buttons #69
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This commit includes 3 changes:
Javascript preloads images needed for the animator buttons, resolving issue Pre-fetch images for the animator step-forward/back buttons #57 , as part of issue Improve the javascript webpages #6. This involves changes to the imt_dropdown.js file, which implies a minor release, so the version number is incremented to 0.6.0 (and documentaiton rebuilt).
large json files are chunked, for memory efficiency in the browser when unpacking. Hopefully this should allow internet explorer to open very large pages.
savefig catches file paths with a double // between the database directory and the rest of the file path (which tripped up @jcmt ).