mtools: old style configuration

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1 3.7 Backwards compatibility with old configuration file syntax
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1 The syntax described herein is new for version `mtools-3.0'. The old
1 line-oriented syntax is still supported. Each line beginning with a
1 single letter is considered to be a drive description using the old
1 syntax. Old style and new style drive sections may be mixed within the
1 same configuration file, in order to make upgrading easier. Support for
1 the old syntax will be phased out eventually, and in order to discourage
1 its use, I purposefully omit its description here.
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