Updates to the dictionary

[mondo primus]

Following the comments in other topics, we have updated the features of the dictionary.

What's new:
- new home page with other options and links.
- all links are now blue and easier to see.
- the previous and next words are back, but slightly different in format.
- classes of objects are added (bone, artery, vein etc.) as well as the subject (anatomy).
- new subject pages that list in columns (we think this is better than on the old OMD pages).

Your comments and suggestions for further improvements are most welcome....

[Yorkshire Pudding]

Hey guys,

loving the new additions to the dictionary, especially the previous and next options!

[mondo primus]

More updates ...

There are now multiple dictionaries provided and their subject listings can be access from the dictionary menu.

Other tweaks:

- the dictionary in which the entry resides is displayed, try PVC as an example
- the prefixes have been tidied up and corrected
- the suffixes ditto ..
- more links have been added to the dictionary home page
- entries will be classified into subjects and object classes, for example a muscle is an object but falls into the anatomy subject.

We would welcome suggestions for further improvement.