Methods generics, and common methods

[stemangiola]

• from SE to tibble. Is used in tidybulk explicitly (as_tibble) and in tidySE in the print method
• bind_cols, bind_rows. Here the problem is that dplyr seems to declare these as functions rather than methods

[stemangiola]

I have created a service package for the moment just with join_feature method, which is common to SCE and seurat