Package metadata (including package version) inconsistent in source files

[bignose-debian]

The Emacs package metadata is not consistent between the various source files.

This can lead to numerous issues; one in particular is that the Version field is different across various files, and has not been kept updated for the actual value of the package version as released. Tools which automatically read the Version will get an incorrect value.

Another is that GNU GPL notice of copyright and license is starting to vary between different source files. Tools that detect copyright information, and other package metadata, will not get consistent results.

The source files can be brought more into line with the GNU GPL, and with the Emacs package metadata specification.

[bignose-debian]

The changes in branch wip/issue/140/package-metadata of my personal fork repository, address this issue.

(GitHub has instructions for how to collaborate with a remote repository.)

The branch merges cleanly to 'master' at the time of writing this.

[bignose-debian]

The changes above also consolidate the package metadata so that it is easier to maintain; consistent formatting, and removal of many superfluous repetitions of overall-package metadata (which had already begun to vary incorrectly).