package ‘mvtnorm’ is not available (for R version 3.4.1)

@mwebster @paulmc

This was discovered after investigating this message from the mailing list:

Hi FSL experts,I'm having some problems with FIX installing. When I try to install R (package party), I recieve this error message: ERROR: dependencies ‘mvtnorm’, ‘strucchange’, ‘coin’, ‘zoo’, ‘sandwich’ are not available for package ‘party’* removing ‘/Applications/fsl/fslpython/envs/fslpython/lib/R/library/party’ Installation failed: Command failed (1) There is another way to do that, please? Thanks a lot.

Upon investigation:

install.packages("mvtnorm")

produces this error package ‘mvtnorm’ is not available (for R version 3.4.1)

The mvtnorm CRAN website lists R >= 3.5 as the required R version.

Suggested fix

[WIP] Upgrade R to 3.5, update FIX README, to new R version, attempt install.