------
+ Show detailed errors from mutalyzer
+ Use mutalyzer_hgvs_parser to check user input
+ Include the smallest scale a transcript can be drawn at in the error message
when the scale is too small
+ Fix a bug where the legend is truncated if it is wider than the transcript,
but smaller than the page
+ Add check for invalid values for `--width`, `--height`, `--scale` and `--gap`
when drawing
+ Scale estimated legend size with the specified `--height`
+ Add explicit `--scale` option
+ Fix a bug breaking `--firstexon` and `--lastexon` option