opal.file_write: Write a file
In datashield/opal: Opal R and Datashield utils

Write a file from the Opal file system into the R session workspace

1	opal.file_write(opal, source, destination = NULL)

`opal`	Opal object.
`source`	Path to the file in the Opal file system (must exists and be accessible for the user).
`destination`	Path to the destination file, relative to the R session workspace. Any required sub-folders will be created. If ommitted, file with same name will be written.

## Not run: 
# user home expansion
opal.file_write(o, "~/spss/DatabaseTest.sav")
# rename file
opal.file_write(o, "/home/administrator/spss/DatabaseTest.sav", "x.sav")
# create sub-folder
opal.file_write(o, "/home/administrator/spss/DatabaseTest.sav", "test/x.sav")

## End(Not run)