Version 0.2.4

Spatial map viewer improvements:

• Dramatic improvement in time to render the charts, especially with 2x2 fields.

Analysis addin:

• Save nearest neighbor and count within detail as tab-separated text files
  instead of CSV files. This allows the detail files to be used as input
  to a second run of the analysis addin.
• Improved heatmaps in Charts output:
  • Maximum of eight heatmaps per page
  • Split the facet titles so the full Slide or Annotation ID is visible
• Better nearest_neighbor_summary
  • Avoid warnings from min and max and return NA for all values
    when there are no examples of a phenotype (#20).

Unmixing quality report:

• Tables show components as ordered in the data, not in alphabetical order.
• Pixel intensity chart uses actual pixel intensity as labels on the x-axis,
  rather than log10 values.

Component levels report:

• Charts use actual pixel intensity as labels on the x-axis,
  rather than log10 values.