Few bugs and a feature req from testing Subsurface

[Dirk Hohndel]

On Sat, 2014-03-15 at 17:54 -0700, Dirk Hohndel wrote:
> > And right now I don't think we have any way to remove gas events...
> 
> Details, details. I'll fix that.

I just pushed a commit that fixes this.

I have several doubts about the commit. 

a) I don't know why the selection with ->items() didn't work. Switching
over to ->itemAt() produced the desired result, but still, something is
odd here.

b) even though I also brought back the hide event code from the old
profile, for some reason that doesn't work at all. I'm calling hide() on
the DiveEventItem (I had lots of qDebug() in the code to verify that)
but it still stays visible.

Qt experts, please help!

/D