add props to dataset and pipelines + small fix to cacher #266
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I added these properties to allow easy access to operation objects in UKBB dataset's pipelines.
In my case, I used it to retrieve the number of features from a "dataframe loading operation". After the dataset was created this operation stored the number of features in one of its internal field members.
small fix for cacher - moved the writing of the pipeline description after the creation of the directory