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Prepare an XMLRPC logoff method. Rationale: XMLRPC is thought for
script, which typically should not store their authentication cookies on
disk. However: 1st: DW cannot tell if an external script is

Prepare an XMLRPC logoff method. Rationale: XMLRPC is thought for
script, which typically should not store their authentication cookies on
disk. However: 1st: DW cannot tell if an external script is in this
respect well-behaved. 2nd: it does not hurt to provide means for a
voluntary log-out.

There are, BTW, two parts of authentication data: one is stored in the
cookie-storage of the client, and the other part is stored in the
session data of the DW instance on the server. This logoff call is
responsible for invalidating the credentials stored on the server,
regardless of any cookie data remaining (or being stolen) on the client
side.

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bugfix and reformatting changelog. small chunck unittests

Improve changelog reading. Inclusive unittests for chunks smaller than changelog lines.

rename function _getProperMediaRevision to _getLastMediaRevisionAt
reduce a bit duplicated code

restore old version of pageinfo()

localize msg

fix function name media_isexternal()
remove empty rev from ml()
rename getProperRevision() to getLastRevisionAt()
make getLastRevisionAt() a method of ChangeLog

remove property rev from xhtml.php
changed variable name $create_time to $modified_time

fix not updated call, renaming

refactor PageRevisionLog into Media- and PageChangelog extending Changelog

Improved isCurrentRevision(), tests included

add parameter at($DATE_AT) and mind revisions

isCurrentPage is page dependent

update function calls to changelog functions

page related changelog reading refactored to class

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swapped logic for allowing/disabling registration in installer

changed user approval option to disable registration option in installer

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