OptionArg<double> doesnt allow negative numbers

[Peter]

needed for ticket:413

I get the following error:

./psd --min-temp="-60"
psd: : invalid option -- 6
Try `psd --help' for more information.

I've tried

./psd --min-temp=-60
./psd --min-temp -60

and they all give the same error.

[Peter]

(In [1431]) refs #418 - added a test for this bug. The test is not active in the sense it does not affect the retunred value, but in verbose mode there is some output.

[Peter]

The problem is that Option::parse is taking arguments by value. In end of parse in OptionArg? there is a call ++first, but this has no effect outside in CommandLine so iterator pointing to current parameter is then pointing to "-6" and there is no such option. If replacing "-6" with "6", the "6" is detected not to be an option (since it doesn't start with '-') and that element is just ignored (see ticket:413). This also implies that if ticket:413 is implemented (the "6" is not ignored) this will cause a problem, so it probably better to fix this first.

I was hoping to fix this within 0.4 but I'll give up since it is more or less impossible without changing the interface.

[Peter]

(In [1465]) fixes #418