This event handles both known core types and unknown types as default

re-add PR #470 again.

This was previously carried out in three separate places. Refactor
that code to use the new function.

Update tpl_pageTitle test to use a manager level admin plugin.

add unit test coverage

    See Issue #1149
    - Show 'admin' or the admin plugin name for admin functions
    - Show action name for user & site actions, e.g. login, sitemape
    - Show page name + action for page actions, e.g. changes, backlinks
    - Show a utf8 pen glyph when editing
    - Otherwise show the page name (as previously)

This reverts commit c2fbf986.

See Issue #1149
- Show 'admin' or the admin plugin name for admin functions
- Show action name for user & site actions, e.g. login, sitemape
- Show page name + action for page actions, e.g. changes, backlinks
- Show a utf8 pen glyph when editing
- Otherwise show the page name (as previously)

This reverts commit 3940c519 as
discussed in #1082.

This reverts commit 362a4f08.

Added placeholder in search textarea

In an older version of PHP a file_exists() call would issue a warning
when the file did not exist. This was fixed in later PHP releases. Since
we require PHP 5.3 now, there's no need to supress any error here
anymore. This might even give a minor performance boost.

As described in the common idioms of the HTML5 spec, mark up navigation as a list inside a `nav` element for better semantics and accessibility.

see:

  * http://www.w3.org/html/wg/drafts/html/master/common-idioms.html#rel-up
  * http://lists.w3.org/Archives/Public/public-html/2013Nov/thread.html#msg6
  * https://dl.dropboxusercontent.com/u/377471/breadcrumb.html

for discussion and background.

many PHPDocs
some unused variables
some dynamically declared variables declared

different types
unused vars
PHPDocs

Removed creation of <meta name="date" as suggested in issue #740 thread

This should be superseded by a proper rewrite of the media manager code

Fixes #692

Run jpeg meta tags through cleanText for a conversion to UTF-8
from latin-1 if possible.  MediaManager already uses this
conversion.  Addresses a side issue of FS#1988

- refactor detail en mediamanager link creation
- refactor metadata listing

Implements an event which can modify the link below usernames, and the
displayed user name.

When no name supplied, the name of currently logged-in user is used.