Documentation: Fix permissions on Ubuntu and relative instead of absolute default times in planner

[Robert C. Helling]

On May 8, 2013, at 3:21 PM, Dirk Hohndel wrote:

> We need to update the documentation here and there.

Which prompts me to send the promised patch.

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It contains two changes: One documents the fact that in the planner the default for time is relative and an absolute time needs an @ sign.

The other hopefully explains how to solve permission problems for USB devices on Ubuntu: I am told, an USB dongle that pretends to be a serial port by default does not have the required permissions for the standard user to write. The transfer then fails with an 'obscure' error message. The transfer works if subsurface is run by root (which obviously is a bad idea, BTW, is the backdoor code still there?) or with chmod. Unfortunately, at least Ubuntu 'fixes' permissions on reboot. So one either has to fiddle with this (seems to be more complicated) or add the user to the group 'dialout" which gets write permissions to serial lines. 

This is in theory. I don't have access to an Ubuntu installation to see if all this is indeed the case. That's why I did not send the patch in the past. But I think this is still better than what we have so far. So:

Signed-off-by: Robert C. Helling <helling at atdotde.de>

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Robert C. Helling     Elite Master Course Theoretical and Mathematical Physics  
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