with unittests

Now classes and data- attributes can be added to individual options

This is required for the filelist plugin to fix issue #11 since $lastlevel became protected in "hrun".

RemoteAPICore
- visibility methods
- getAttachmentInfo returns modification date of deleted files
- pageVersions returns only current revision (once) if $first=0.
Adresses issue mentioned at #1550
- added unittests
- updated API number

Fixes #714

Fixes #713

Since Firebug it is no longer necessary to structure html with linebreaks. See also Issue #924

as pointed out in
https://github.com/splitbrain/dokuwiki/pull/1530/files/b89dfc20f1e13333ce49ce0d6a3a83cc9836094b#r60392099

Caching must differentiate between a call with $ascii == true and a call
without that parameter. Since calling that function with $ascii == true
rare, we simply do not cache that case.

This `$conf['pluginmanager']` setting was especially for disabling of
pluginmanager in farms. (see also commit c45608df )

remaining folders with .disabled in the foldername are displayed in
extension manager with rename warning.

This adds the possibility to define file with protected users in the
config cascade to be used with the plain auth mechanism.

This makes it possible for farms to have way to inherit Farmer users in
animals.

Close #1323

The function wikiFN effectively takes the $clean flag now into account when
caching filepaths and when returning them from cache.

Fixes #1536

Textareas use CRLF, but internally we use LF.

As suggested by @micgro42 the plugin namespace should use a vendor
prefix to avoid name clashes when DokuWiki is integrated with other
software.

@scrutinizer-notifier noticed that the $pageid might be false when
page_findnearest looks for it.

As in wikiFN cleaning the id should be optional, but still the default, in mediaFN as well.

when a form was submitted with an empty input, that data should still
overwrite the preset value.

This is a security measurement supported in Chrome and Opera (and
probably other browsers soonish)

See http://mathiasbynens.github.io/rel-noopener/ for rationale