This should fix a warning in PHP 7.3

Refer to module by suitable file name (mod_*.c).
Test for mod_authz_core.c (instead of mod_authz_host.c) to properly
detect Apache 2.4 and avoid false positive for Apache 2.2.

Not sure why this didn't show up sooner 

If memory is set to unlimited, then memory_limit will be -1, so set this to true in this case.

The parameters passed to triggerUserMod() were wrong.

This change is useful for plugins that may want to implement their own toolbar (and thus hide the
default toolbar), but still would like to let the locktimer set the draft status.

Safemode has been removed in PHP 5.4.0. We finally no longer need to
deal with this insanity.

now the method is aborting early again unless the data is actually used

Sometimes, preparing the data for an event is expensive and only needed
if the event is actually handled. This allows for a quick check before
actually preparing and triggering the event.

This adds an event to dbg_deprecated(). This allows plugins to handle
deprecation warnings. One example would be @cosmocode/dokuwiki-plugin-sentry

One thing I don't like, but don't know how to avaoid is that this
function used to abort super early when $conf['allowdebug'] wasn't set.

However for the sentry plugin you probably would want logs, but still do
not show any debugging to end users (which allow debug would do).

So now the backtrace is always built, the event triggered and then
everything is sent to dbglog() which may simply throw everything away.

Suggestions on how to improve this welcome.

The matches our scheme of where_data_what better

The actual draft text got lost when we changed to showing the diff
instead of the full draft.

Specifically, this pull request checks if the current query is already a
valid pageid and then return that as suggested pageid.

Also, tests are added for this method.

Fixes #2355

PS: We may want to somehow better educate/nudge users to use the better
way of creating pages by creating links on existing pages.

and actually use it in the edit form.