Patches from Reinhard Prix to fix several problems.
(1) apps being suspended would call boinc_finish(nonzero) and core client would treat this as app failure. Introduce a new function boinc_exit() and call that instead. (2) improvements to GUI build with wxWidgets (3) improved X event handling loop now ensures that X window is taken away when window killed. svn path=/trunk/boinc/; revision=5142
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