OKD: Add option to hide dirs

Experts can hide directories, for example from incorrect reprocessings

An SQLite database will store a string with directory, tag, and run name of hidden runs. Created with:

CREATE TABLE HIDDEN_RUNS (ID INTEGER PRIMARY KEY AUTOINCREMENT, RUN_NAME TEXT NOT NULL);

Runs can be hidden on the Directory Summary view and unhidden on the Run Summary view.

Maybe add a block for all hidden directories for non-expert users?

Possible next steps: wrap db access into a separate class and also add back links creation for tables comparison.

@tamartin