KJS::UString methods

[Karl Vogel]

More symbol weirdness..

kdelibs/kjs/ustring.h defines prototypes:

    UString(const QString &);
    QString qstring() const;

but it doesn't provide an implementation, meaning that anyone who uses these 
will get an undefined symbol error at runtime.

The strange thing is, that there is an implementation of those in 
kdelibs/kio/misc/kpac/script.cpp.

Wouldn't it be cleaner & nicer to put the implementation into libkjs itself?! 
And avoiding multiple versions of this in other parts of KDE ?!