opal.file_read: Read a file
In datashield/opal: Opal R and Datashield utils

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

1	opal.file_read(opal, source, destination)

`opal`	Opal object.
`source`	Path to the file in the R session workspace (must exists).
`destination`	Path to the destination file or folder. Any required sub-folders will be created.

## Not run: 
# read into folder
opal.file_read(o,"DatabaseTest.sav", "/tmp")
# read and rename
opal.file_read(o,"test/DatabaseTest.sav", "/tmp/Test.sav")
# user home expansion
opal.file_read(o,"DatabaseTest.sav", "~/coucou/pwel.sav")

## End(Not run)