[feature] Add local sequence-logo drawer for meme seqs

[Kiri2002]

according to doc

If we have internet access, we can create a weblogo:
m.weblogo("mymotif.png")
We should get our logo saved as a PNG in the specified file.

biopython use web to draw logo. But now there are many good local drawer in python, for example:

pyseqlogo

Logomaker, it's paper

so maybe we can pick some merge to biopython? Benefit a lot .

[peterjc]

Perhaps easier to add examples using these to our documentation, or even add an alternative method to our motif code to call these libraries?