#30 ¨Show messages for:¨ can´t be set < 1

[Nicolás de la Torre]

As the sumary says the option on Messages -> Show
massages for: can´t be set to a value below 1.

[Thomas Leonard]

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I've added an option to set when it switches to window mode
(I'm sure you understand why giving users the option to
disable all errors from all applications would be a disaster).