Harmonization of MSI function

[drnickisaac]

@AugustT
MSI function is currently not compatible with the data structure for bma functions. I can convert it as follows

msi_data <- data_in
msi_data$species <- as.factor(as.character(msi_data$species))
msi_data$index <- 10^(msi_data$index) # puts the data on the measurement scale
msi_data$se <- msi_data$index * msi_data$se # delta method - the function actually does the reverse

But it would be better if all the functions accepted data in the same format. Either a wrapper function would do this conversion so that the published version of the MSI function would still be accessible OR allow input options within the function.

[AugustT]

will be addressed

[drnickisaac]

I'll be visiting Arco & Leo in the Hague soon after the Sprint, so I'd like to make this a priority

[AugustT]

Note that this is a sub-issue of #12