Review dependencies and simplify

[aroberge]

Currently, too much is put in the RUR namespace which, while convenient from a programming point of view, makes the dependency graph too tightly coupled. To produce dependency graph, use

dependo -f cjs src/js > temp/dependency.html

Example of things to consider:

• have different functions for record_frame depending on the programming mode
• remove language definitions from RUR namespace and have them in their own namespace(s)

[aroberge]

This is no longer worth keeping as an open issue. Much simplification has been done, and more will be done as part of regular maintenance...