Use "?dontreplace" and ".dontreplace" for escape hatches rather than "?original" and ".do-not-convert"

[rosell-dk]

Why?

• It is easier to remember just one name than two.
• It is a better name than both the others. Specifying "?original" on the original file is a bit weird. As the ".do-not-convert" functionality does not block conversion, but only prevents replacement, it is a misleading name

PS: I don't want to trigger regeneration of .htaccess files due for just this. This means that in order to use the functionality, you must click "Save settings and force new .htaccess rules"

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