Circular genome builder, high coverage gets cut off

[RobJackson28]

See photo below, where high coverage gets cut-off (for alignment of e.g., R59_S11_L001_R2_001.fastq, R59_S11_L001_R1_001.fastq; hpv16_w12_ref.fasta). One way of getting around this is to log-scale the coverage values prior to plotting them. This is commonly done in coverage visualization.

[RobJackson28]

Discussed this with @chgibb, log-scale/transform option should be added

[RobJackson28]

Re-opening this as the current Coverage Depth Scale can be further enhanced with a log10-scale option