SciMoz: add a new scimoz method AnnotationRemoveAtLine(int lineNo) 
http://bugs.activestate.com/show_bug.cgi?id=101900
r=marky
Scintilla overloads AnnotationSetText(line, text): if text is null, remove the annotation at the specified line.  Too hard to implement that, so provide a separate method that just sends the editor a SCI_ANNOTATIONSETTEXT(line, NULL) message.

(integrated from komodo (trunk) change 83514 by ericp)

git-svn-id: http://svn.openkomodo.com/repos/openkomodo/trunk@14158 b87d16e7-d29f-4ee1-b5ec-817d645d335f