Fix pass by reference error, always return an array in lookupKey()

Add minimum length option to index histogram

Increase version tag for new indexer

Fix variable name type in indexer

deleted redundant line

improved actionOK and its use

Implement histogram method of indexer

Indexer version tag should include plugin names

Removing a page from the index deletes related metadata. Cache key names in index.

Indexer::lookupKey callback receives value reference as first arg

Bulgarian language update

Dutch language update

removed duplicate authors from language files

added 'register' and 'resendpwd' to action links and buttons

Attention: $lang['register'] has been renamed to $lang['btn_register'],
anyone using that in any plugin or template should adjust it.

Chinese Language update

Swedish language update

Special handling of title metadata index

Accept empty MySQL password for database auth.

More failsafe XMP parsing in jpeg pictures

French language update

some more fixes on the Greek language

Greek translation revisited

correctly encode quoted email names

do not (re)render metadata in backlinks

A page could have possibly hundreds of backlinks, when the cache is
outdated they should not be rererendered at once

Use Base64 encoding for long subjects FS#2169

Quoted-Printable specifies a maximum line length and some mail tools
(Apple mail and Thunderbird) take this quite serious and will fail to
decode subjec

Use Base64 encoding for long subjects FS#2169

Quoted-Printable specifies a maximum line length and some mail tools
(Apple mail and Thunderbird) take this quite serious and will fail to
decode subjects encoded with quoted-printable when the subject exceeds
the length limit.

The correct fix would be to wrap the header into multiple lines. But
this seems not to be possible with mails() $subject variable.

This patch switches to Base64 encoding for long subjects.

A general decision if switching completely to Base64 is the best way
to go is still open. (see bugreport)

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