KHoliday::HolidayRegionSelector: emit signal when modified

Review Request #100619 - Created Feb. 10, 2011 and submitted - Latest diff uploaded

Information
Romário Rios
kdepimlibs
Reviewers
kdepimlibs, plasma
Makes HolidayRegionSelector emit a signal when something is modified in the widget. Needed for enabling Apply button on plasmaclock config [http://git.reviewboard.kde.org/r/100620/].
Works fine so far, although I'm not sure if the naming is OK.
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