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Reported on mailing list

Reviewed-By: Tobias Hunger

Better fix.

Setting up the debugger connection might fail for a couple of reasons.
Check the application output to show the user a more detailed error
message.

Reviewed-by: hjk

Reviewed-By: hunger

Reviewed-By: hunger

Reviewed-By: hunger

This reverts commit 373000a9.

Optionspages are called even if they weren't shown.

Reviewed-by: con

Avoid double deletions by using shared pointers. Reset the model
after discard as the structure may change. Use qtc_assert
(to catch cases of add/delete again).

Ehm, yeah.

Reviewed-by: Leandro Melo
Reviewed-by: dt

Clean up code.

 * Use same icons for add/remove buttons as Qt4 options page does
 * Pop up menu of add button directly