Werk #7975: Update Dokuwiki to 2018-04-22b

Component	Other components
Title	Update Dokuwiki to 2018-04-22b
Date	Jul 16, 2019
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0b4 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Updated dokuwiki shipped with Checkmk to version 2018-04-22b. Also updated the shipped plugins (bookcreator, changes, include, indexmenu, pagelist) to the current versions.

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