Add option to disable saving of configuration on exit

[Evert Provoost]

There are a couple of reasons why this would be helpful:

1) When giving a presentation I make the typeface larger, however I do not want this change to persist across sessions.

2) I like to keep my config files structured but Sakura overrides this.

3) The time Sakura spends writing the configuration to disk on exit is noticeable, although not really an issue but it feels unnecessary as I never do any changes that I want to persist across sessions.

[scarlehoff (jumax9)]

I thought the `less_questions` options set to true would mean the "save configuration on exit" would be disabled as well but it doesn't seem to work?

[David Gómez (dabisu)]

JumaX9: No, the configuration is always saved (that's the reason of this bug). Less questions options is just to disable some dialogs when sakura is closed.

[David Gómez (dabisu)]

I just added an option for this. It's called "dont_save", so just add "dont_save=true" to your config file. Be aware this option is out of the documentation and/or menus, because when new versions of sakura are released with new config options, if this option is enabled and the config file doesn't have the new options, sakura will surely crash. That's because sakura doesn't provide a default config file and writes needed config values if they're not present.