Update non-shifting timebag evolution plots:
 * removed BC
 * changed number of bins to 15
 * sharing y axis in rows
 * fix position of 'number of words' text in log plots
Update shifting time evolution plots:
 * remove BCs
 * changed number of bins to 15
 * sharing y axis in rows
 * fix position of 'number of words' text in log plots
 * fix error in shifting_min20 which was using bad data
Merge branch 'finish-remove-BCs-and-rescale-tbgsevolutions'