[myank] Keep `*mclef`, `*oclef`, `*mmet` and `*omet` interpretations

[WolfgangDrescher]

Closes #94

This is not the best solution as a lot of code is repeated, but it works… Having a look at modori we should probably also add *ok and *mk, *oI", *mI", *oI', *mI'.

Could you please check the changes in Tool_myank::getMetStates and especially the regex in Tool_myank::getLocalMetInfo. I'm not sure I caught this edge case.