Set repos rather than passing repos to BiocManager::install() for macs

[jwokaty]

Set options(repos) rather than passing repos to BiocManager::install():

          ID: install_bioc_rhdf5                                                                                                                                             
    Function: cmd.run                                                                                                                                                        
        Name: Rscript -e "library(BiocManager); BiocManager::install('rhdf5', repos=c('http://lib.stat.cmu.edu/R/CRAN/', 'https://bioconductor.org/3.19/packages/bioc/', 'htt
ps://bioconductor.org/3.19/packages/data/experiment', 'https://bioconductor.org/3.19/packages/data/annotation'))"                                                            
      Result: False                                                                                                                                                          
     Comment: Command "Rscript -e "library(BiocManager); BiocManager::install('rhdf5', repos=c('http://lib.stat.cmu.edu/R/CRAN/', 'https://bioconductor.org/3.19/packages/bio
c/', 'https://bioconductor.org/3.19/packages/data/experiment', 'https://bioconductor.org/3.19/packages/data/annotation'))"" run                                              
     Started: 13:15:08.330617                                                                                                                                                
    Duration: 564.49 ms                                                                                                                                                      
     Changes:                                                                                                                                                                
              ----------                                                                                                                                                     
              pid:                                                                                                                                                           
                  43215                                                                                                                                                      
              retcode:                                                                                                                                                       
                  1                                                                                                                                                          
              stderr:                                                                                                                                                        
                  Error: 'repos' argument to 'install()' not allowed                                                                                                         
                  Execution halted                                                                                                                                           
              stdout: