handle bz (bzip not bzip2) better

fixes from bee9f377 commit notes

in fact .tbz is tar.bz (bzip1) and .tbz2 is what tar.bz2 is used
commonly.

Added unit tests

Hurray, tests pass!

Currently both the 2nd and the third assertions fail
(the first one is just for upcoming non-regression)

wiki.getAttachments returns 'perms' according to documentation

Because wiki.getAttachments now returns 'perms' instead of 'perm'

Check search limit depth with an inequality

Don't remove page version from result if uneeded

Before this change the last modification time was taken from metadata
and then the revision that was specified there was loaded from the
attic. Now revisions from attic are only loaded when the page has been
modified more recently and the date is normally the last modification
time of the page source. This was a problem when the most recent change
was an external edit, then an older revision was shown in the feed.

It may happen when the page has few versions

At least if we want to be consistent with search_universal

Otherwise, when we check for equality, the test fails if the search start beneath
the max depth.
Eg: if I have the page ns1:ns2:mypage in my wiki, and launch the xmlrpc query
getPagelist("ns1", "depth => 1"), without this patch, it retrieves mypage

Indexer: Add the PID to INDEXER_PAGE_ADD and add getPID/getPageFromPID functions

Made auth_aclcheck always return int

xmlrpc putPage and appendPage should return bool

According to dokuwiki's documentation (https://www.dokuwiki.org/devel:xmlrpc#wikiputpage),
those methods should return booleans, not int.

The returned type is important in particular when we deal with xmlrpc. Indeed,
this value is directly returned to the client eg when the wiki.getAllPages method
is queried.

Currently the 'perms' attribute may be either an int or a string, and its up to
the xmlrpc client to resolve it (although Dokuwiki's documentation only tells it
can be an int).

This patch makes sure we'll always return perms as int.

added option to enable automatic popularity data in installer

de/de-informal: language updates / added "sidebar"