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Bugfix: copying pages wasn't working due to the csrf-check.

To resolve this we extend from BackendBaseActionIndex instead of
BackendBaseActionDelete where the csrf-check is performed automatically
Groups: bugfix: double usage of variable caused unexpected behavior.
Merge branch 'master' into 3.6-wip
Merged CHANGELOG and altered version
Fixed some PHPDoc
Updated dependencies
Use Symfony instead of SpoonFile
Bugfix: don't reassign values when passing them to Akismet.
Bugfix: token is used as a parameter, so it shouldn't be passed

When building a link we want at least one parameter, so we can be
sure we can append other parameters without hassle.

But in Analytics token is a key that is used, which messed it up.
Bugfix: files is a method, not a property
Blog: bugfix for limit in getRelated

getRelated didn't listen to $limit. F.e.: you want 10 related items,
but you only got 5, because the $limit in
FrontendTagsModel::getRelatedItemsByTags is 5 by default.
Changelog updated.
files is a method not a property
App logs and cache folder added
App logs and cache folder added
Layout installer for cache and logs folder
Mailmotor: bugfix: use correct path to mailmotor.
Mailmotor: after an output the exection of the method should be stopped.