pls change special seq name in OTB dataset

[laisimiao]

Recently I use got10k.datasets scripts in my project and I am very grateful for that.
But I really advise you to change special seq names in OTB dataset: like Jogging.1, Jogging.2, Skating2.1, Skating2.2 to Jogging_1, Jogging_2, Skating2_1, Skating2_2.
Because many algorithms' codes choose the latter, so I need to rename them in many places, so can you improve it while give a better user experience. Just modify a string:
from
[renamed_seqs.append('%s.%d' % (seq_name, ind))]
to
[renamed_seqs.append('%s_%d' % (seq_name, ind))]

@huanglianghua