Merge pull request #18 from mprins/master

This PR adds a Dutch language file and translation
New pagequery cheatsheet popup button on toolbar

NEW: added a useful cheatsheet popup via a edit toolbar button, to help
compose a new pagequery.  Used jQuery Dialog UI.
Merge branch 'master' of github.com:MrBertie/pagequery
Cache the cheatsheet html for toolbar (quicker)
Refactoring; bugfixes; better showcount display

CHG: refactored the render_as_html_column function for clarity
FIX: updated p_get_metadata parameters to match newer release
CHG: moved the show-count indicator to the right next to Top symbol
Refactored into separate class for clarity

CHG: moved all pagequery building/rendering functions into a separate
class; makes it much easier to understand the code.
CHG: moved toolbar listing into a \res folder
CHG: tiny change to show count symbol
CHG: lots of clean up, refactoring and line sorting
Only pass lang strings to PageQuery object
Minor code changes interally

CHG: removed extra call to $opt['query']
CHG: remove superfluous comments, variable renaming
Fixed regression; code alignment
Fixed wrong filename casing

FIX: caused fatal crash on Linux
Fixed hidestart option ignored by fulltext search

FIX: the hidestart and page validation was not being honoured when doing
a fulltext search
Improved code dealing with fullregex internallly

CHG: improved code dealing with fullregex; no namespace check for
fullregex---not necessary
Fixed meta date and empty links issues 22-24
Use title for NS group headers also

CHG: show first heading for namespace group headings also (where
available in start page)
CHG: better handling of upper case words in links and headings
FIX: problem with tracking how how many snippets are shown, when
multiple querys are used on same page.
FIX: revert to PHP 5.3 array syntax on line 428.
FIX: sort and group by heading not working correctly
FIX: umlauts not recognised in abc grouping
Update plugin.info.txt
Fix for PHP Strict
Fix for PHP Strict