merge old auth style configs with plugin config

moved adLDAP to authad plugin and fixed includes

added PCRE UTF-8 checks to do=check FS#2636

avoid multiple paralell update checks

we now touch the messages before the actual update happens. this should
lower the chance of more than one update check running at a time.

fix regression bug in HTTPClient FS#2621

In the recent refactoring of the HTTPClient, a problem with certain
systems was reintroduced. On these systems a select() call always
waits for a timeout on

fix regression bug in HTTPClient FS#2621

In the recent refactoring of the HTTPClient, a problem with certain
systems was reintroduced. On these systems a select() call always
waits for a timeout on the first call before working properly on the
second call.

This patch reintroduces the shorter timeouts with usleep rate limiting
again.

Since this bug is not reproducible on other systems it can't be unit
tested unfortunately.

show more ...

added simple compatibility wrapper for old TarLib

changed PAGEUTILS_ID_HIDEPAGE to has BEFORE/AFTER

Tar: support for creating archives with long filenames

The library now creates either a POSIX ustar prefix or a GNU longlink
entry for files which have a name longer than 100 bytes

Tar: Added extraction support for long file names

Supports POSIX ustar prefixes and GNU longlink entries

removed old TarLib and changed plugin manager to use new one

Completely rewritten Tar library

This new class is only losely based on our previous library. The
whole API was changed to make it more flexible and memory saving.

Some fisrt unit tests are included

TarLib code cleanup

TarLib: fixed appending in non-dynamic mode

Appending files now works at least for uncompressed tar files. Seeking
in compressed tars is not yet supported.

fixed third method of adding files in TarLib

You can give a path and file contents in an array. However this didn't
work because the file_exist() check was done before checking for an
array

fix lone zero block in TarLib created archives

fix use of constructor in TarLib

Slovak language update

Korean language update

Latvian language update

added event PAGEUTILS_ID_HIDEPAGE

removed redundant variables in tpl_include_page() (because of 3ff8773b)

Persian language update

Spanish language update

russian language update

Kazach language update