Corrected gr/anaconda scripts

- added '-t' switch to specify the workstation type on the command line
- allow site-specific environemnts (${GRDIR}/etc/grrc)
- support both Python and iPython

Change-Id: I64783b9a87c8885184b3af0a16513326d9c55ae6
Reviewed-on: https://iffwww.iff.kfa-juelich.de/review/69
Reviewed-by: Josef Heinen <j.heinen@fz-juelich.de>
release v0.6.2

Change-Id: I1818ed9b8cfcb99f04f2ea6fb7f1efcf2802a656
Reviewed-on: https://iffwww.iff.kfa-juelich.de/review/70
Reviewed-by: Josef Heinen <j.heinen@fz-juelich.de>