Using ~ (tilde) for refering to the home directory does not work for JDL parameter "exec_file"

[jgaida]

For JDL parameter "exec_file", $HOME works fine but ~ (tilde) does not:

------------------------------------------------------------------------------
15392: (open) WORKING_DIRECTORY_ERROR of job 829 at 2016-03-11T10:36:58+01:00 on lyon
The job exited because of a working directory error. NFS problem on the cluster?;
------------------------------------------------------------------------------

Full example:

{
  "name": "Povray Landscape",  

  "resources": "nodes=1", 
  "walltime": "00:30:00", 
  "exec_file": "~/cigri/pov/pov.sh",
  "exec_directory": "~/cigri/pov-tmp/",

  "nb_jobs": 4,

  "clusters": {   
    "lyon": {}
  }

}

It is confusing because ~ (tilde) does work for exec_file.