bug#18687: mw: modular MediaWiki interface for Emacs

[Ivan Shmakov <ivan@siamics.net>]

	Some of the changes to the code are now went public [1, 2].
	(Note the s/2014/2015/ year change in the URIs.)

[1] https://am-1.org/~ivan/archives/git/mw-el-2015.git
[2] https://am-1.org/~ivan/archives/git/gitweb.cgi?p=mw-el-2015.git

	There, I’ve decided to rewind ‘master’ by three revisions (back
	to 05d33edc); then put one of them (with the commit message
	edited for better correctness), as well as 4 revisions formerly
	of ‘fixes-x54a46898’ (see [3]), and 8 more fresh ones, to the
	new ‘exp-x54e65706’ branch.

	One of the changes (17ebb542) introduces the “top-level” mw.el
	file, which provides a ‘defgroup’, and is required by GNU ELPA.
	I hope someone could review if I’ve done this part correctly.

[3] news:87sifu43io.fsf@violet.siamics.net
    http://debbugs.gnu.org/18687#msg44

	This still leaves some code I’d like to add before pushing the
	Git history to GNU ELPA, but I feel I’m roughly halfway of what
	I’ve planned for 0.2.

	A summary of the changes is as follows.

 2fd573e0 New ‘mw-info-princ-alist’ and ‘mw-info-princ-voa’ functions.

	    The latter generalizes the former ‘vc-mw-print-revisions’.

 6d740471 New ‘vc-mw-revision-query-alist’ customizable variable.

	    This one allows for an empty “continuation cookie” to be
	    added to all the vc-mw.el queries in order to silence a
	    warning emitted by newer MediaWiki versions.  Also, it
	    allows for the set of entries shown by vc-print-log to be
	    customized, – to the extent supported by the remote
	    MediaWiki instance.

 76b50f8c Fixed token logic in ‘vc-mw-buffer-page-info’ and
          ‘vc-mw-find-revision’.

	    Now the tokens will be correctly requested whenever the
	    remote is queried, /except/ for the log (IOW,
	    ‘vc-mw-print-log’.)

 b3a39473 New ‘mw-xapi-adjoin-token-request’ function.

 bf8a70ce Promote several variables to customizable status.

	    Namely: ‘mw-api-response-hook’ (which is also marked for
	    autoloading, as a hook variable with a non-nil default
	    value), ‘mw-buffer-associate-page-hook’,
	    ‘mw-buffer-endpoint-safe-hook’,
	    ‘mw-buffer-try-file-name-hook’.

 215e4a07 Split token handling into new mw-xapi.el off mw-api.el.

	    Which means that ‘mw-xapi-token’ is the new name for
	    ‘mw-api-token’.  Also introduces ‘mw-api-response-hook’.

 21f8d096 Bump the version to 0.2 and update copyright years.

	    This does /not/ include mw.el, as updating that would
	    (I presume) trigger a release on GNU ELPA.

 17ebb542 New mw.el replaces mw-pkg.el, anticipating the forthcoming
	  GNU ELPA inclusion.

	    Also introduces ‘mw-buffer’, ‘mw-api’, and the package’s
	    top-level ‘mw’ customization groups.

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