plugin unit tests are in /lib/plugins/<pluginname>/_testing

verify that multiple requests can be made with multiple test methods.

…ional (might be FS#2480)

We had a lot of options lumped together under "Advanced Settings". I
introduced two more categories and move a few options to other existing
categories.
I also reordered the appropriate entries in the source files to make it
easier to find stuff when extending the options.

using the awesome httpbin.org service

fixes passing null to event hook registration

This allows us to distribute plugins that are disabled by default. We'll
may want to do that for a special unit test plugin

This should make it much easier to do integration tests based on the new
TestRequest utility.

There's still more that I'd like to moved out. bootstrap should not
contain any logic but only call the appropriate functions for setup the
test environment.

#96 (comment)

* master: (29 commits)
  some edge case checking in search result highlighting
  Resolve empty page ID to configured start page
  Added more detail error code for unauthorized calls in xmlrpc interface.
  changed internal Mailer members from private to protected
  made it possible to disable HTML mails in the config
  removed commented code left from the quoted_printable days
  add missing table tags for HTML diff mails
  fixed subscriber mail signatures
  use real HRs in HTML mails
  Add various headers to the mails FS#2247. pull request #83 closed
  removed footer image from HTML mails
  use inlinestyles for diffs in HTML mails
  fixed signature stripping
  fixed mailprefix handling
  fixed missing replacement for HTML notify mails
  allow image embeds in HTML mail templates
  Added HTML wrapper for mails
  allow non-txt extensions when accessing locales
  added Mailer class to autoloader
  Replaced mail_send calls with new Mailer class
  ...

This didn't really need runkit. The way runkit was used didn't add any
more credibility to the test result

removed unneeded data files, converted tabs to spaces

The test can be skipped by excluding the "slow" group.

* master:
  added option to disable reverse DNS lookups

this fixes the HTTP tests which do test the base class directly instead
of the DokuHTTPClient subclass

according to Dominik Eckelmann  one of the tests fails on certain servers. I can't
reproduce it. If you can, please open a bug report with as much info as
possible.

Input iteration counts are squared in the function and passing something
above 30 is giving integer overflows on 32 bit systems (and causes insane
iteration counts on 64bit systems).