doc, man: Clarify terminology for Debian control files
Their current descriptive names are very close and easily confused if
one is not paying close attention. Use new terminology that tries to
make them less ambiguous and more intuitive.
The new and unified terms are:
* debian/control: «Debian source package template control file»
* .dsc: «Debian source package control file»
* DEBIAN/control: «Debian binary package control file»
* .changes: «Debian upload changes control file»
For contents we use these new terms:
First stanza in debian/control: «source package stanza»
Next stanzas in debian/control: «binary package stanza»