Bug: when fontsize is changed colorbar scale may be wrong

[lldelisle]

Here is an example of what can happen when we change the fontsize:
Left is without specifying the fontsize, Right is using --fontSize 16

You can see that the picture stay the same but the colorbar is wrong.
This is due to:

pyGenomeTracks/pygenometracks/tracks/HiCMatrixTrack.py

Lines 378 to 389 in 1c6b592

	ticks = cobar.ax.get_yticks()
	labels = cobar.ax.set_yticklabels(ticks.astype('float32'))
	(vmin, vmax) = cobar.mappable.get_clim()
	for idx in np.where(ticks == vmin)[0]:
	# if the label is at the start of the colobar
	# move it above avoid being cut or overlapping with other track
	labels[idx].set_verticalalignment('bottom')
	for idx in np.where(ticks == vmax)[0]:
	# if the label is at the end of the colobar
	# move it a bit inside to avoid overlapping
	# with other labels
	labels[idx].set_verticalalignment('top')

Because the label are fixed but not the ticks...

[lldelisle]

Fixed