Calc function names saved to file and backward compatibility

[Winfried Donkers]

Hi Eike,

> What we usually do is add a compatibility name to older release branches
> so the next release there can read both, the new name and the old name,
> but continues to write the old name so earlier releases of the same
> (usually two) branches are not affected.
> 
> Then for the next release branch (now master) switch from writing the old
> name to writing the new name, but still accept the old name "forever".
> 
> You can find examples of that in sc/source/core/tool/compiler.cxx
> ScCompiler::IsOpCode() in aOdffAliases.

Thank you for your explanation.

I will start with it.

Winfried