Turn of replotting while the cylinder type combo box is active

Since replotting is expensive and it is triggered while scrolling
through the list of cylinders, better not do it for improved
user experience and replot only after the combo box loses
focus.

I hope this...

Fixes #768

Signed-off-by: Robert C. Helling <helling@atdotde.de>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Added the option of opening User Survey form explicitly

Earlier, there was no option for the user to explicitly open the User
Survey form. This has been corrected by placing an option in the "Help"
menu by which the user can explicity open the User Survey form.

Signed-off-by: Nikhil Bharadwaj Gosala <nikhil.gosala@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Modified the UI of the User Survey Page

The UI in the User Survey page was not clear and the Text Blocks were getting
cut. So I increased the size of the Text Blocks.

Also the survey was using CheckBoxes instead of RadioButtons. The problem with
this is that the user could choose to be both Recreational and Technical diver
which cannot be possible. So I replaced the CheckBoxes with RadioButtons.

I also replaced the CheckBoxes, which asked the user from where he was importing data, with RadioButtons so that the user can select only one option.

I also modified the English used and made it concise and clear.

Signed-off by : Nikhil Bharadwaj Gosala <nikhil.gosala@gmail.com>

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Modification to the User Survey UI

As per the suggestion by Dirk Hohndel, I changed the "Type of Diver" from
RadioButton to Checkbox.

The User Survey UI was not clear earlier, so I grouped the similar options under
a question. I also modified the language and re-arranged the visual components.

Earlier, the user could choose contradicting import types at once. This has beencorrected by using RadioButtons instead of CheckBoxes.

Signed-off-by : Nikhil Bharadwaj Gosala <nikhil.gosala@gmail.com>

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>