Renames 'RDFterm-equal' to 'sameValue'

[hartig]

As discussed in #25, renames the RDFterm-equal function to sameValue. Also, as suggested by @afs, this PR adds a legacy anchor (with an HTML comment that this is anchor is obsolete now, as done for similar cases in RDF-Concepts)

For the sake of keeping this PR small and focused, it does not include any changes to the definition of the renamed function (as are currently discussed in #187, and also related to #182).

Closes #25

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[afs]

This will conflict with #194 which reorders the sections.

[hartig]

This will conflict with #194 which reorders the sections.

Ah! I didn't pay attention to #194, probably because it is marked as draft. Sorry!!

In this case, I will keep this PR open for the moment but are ready to drop it if we decide to go forward with #194 (for which I would have preferred it didn't contain both the change of the order of the sections and the change of the definition of RDFterm-equal).

[afs]

I don't think we have decided whether to have sameValue in the grammar or not.

[afs]

(for which I would have preferred it didn't contain both the change of the order of the sections and the change of the definition of RDFterm-equal).

Sorry, but there are overheads when there are chains PRs.

[hartig]

I don't think we have decided whether to have sameValue in the grammar or not.

The change in this PR is not about adding anything to the grammar but only about changing the name of the function that is used to define = in the last two cases in the operator mapping table. I know that you also proposed to consider supporting this function directly as a new keyword, but as I saw this as an orthogonal question, I didn't include it in this PR.

[hartig]

Sorry, but there are overheads when there are chains PRs.

Understood.

[afs]

After trying to apply this to #194 and finding the patch does not apply - and there new uses of RDFterm-equal in #194 -
I've copied changes into #194.

There are now two uses of the string RDFterm-equal - the obsolate anchor and the "Changes" entry.

[afs]

This is carried out in #194 which is in the same area.