v0.1.3

New features:

• New RStudio Addin - "Merge cell seg files" merges inForm output from
  individual fields, similar to the inForm Merge tab.
• merge_cell_seg_files function performs the merge.

Misc:

• Update the link to Phenoptics home page.
• compute_mean_expression_many ignores duplicate parameter definitions
  instead of stopping with an obscure error.
• compute_density_from_cell_summary doesn't require a Phenotype column
  in the cell seg summary data.
• split_phenotypes doesn't require a Confidence column in the source data.
• split_phenotypes recognizes whitespace as a phenotype separator.