Bug Fix for 1934

Update to versions of PHP 5.5.1 have PCRE 8.34, which changes prep_ pattern matching, causing a Bug where Charts do not display.

See Bug report

I have replaced the pattern in JsCharts.php correcting a compilation error

I also added Kdevelop IDE files to .gitignore ( .kdev4 ), for my own convenience, but if others wish to use Kdevelop this might be useful.

Contributors agreement is in your inbox.

Hope this is useful

Thanks
Rick