Batch transformations.

[antagomir]

Create Function to add given transformation to all altExps / ranks at once, or at least provide an example in OMA/mia.

This is handy also since methods like agglomerateFeaturesByRank or splitByRank will only deal with count and relabundance assays, and ignore the rest (like CLR, which does translate directly in such operations). Hence there is often a need to add transformations in batch for all altExps after such operations.