Explain search for sub-toolchains in robot-paths

[Flamefire]

EB not only searches for *-GCC-* but also for *-GCCcore-* if no file was found using the former

[JDiprose]

A link to https://docs.easybuild.io/common-toolchains/#toolchains_diagram might also help here, as a clear picture of the toolchain layers. Perhaps:
EB also searches for modules of the same name and version that use lower-level toolchain components from the same chain, eg -GCCcore- for an original -GCC-. See the toolchain documentation | https://docs.easybuild.io/common-toolchains/#toolchains_diagram for a fuller explanation.
I'll see if I can suggest that in the file.

[JDiprose]

Ah, you've already got it! This would have helped me.

[JDiprose]

Note that it is not an indefinite-depth search, so if you have cloned the easybuilders/easybuild-easyconfigs git repo then you need 'easybuild-easyconfigs/easybuild/easyconfigs' on your robot-path.

[Flamefire]

I just added c7567cd
Is that comprehensible enough?