Decided that uiLabels should be top-aligned; implemented on GTK+. Other backends don't need changing.

TODO.md

@@ -35,3 +35,6 @@ ultimately:
 - add some sort of runtime type checking
 - MAYBE readd lifetime handling/destruction blocking
 - figure out how to integrate leak checking into the source tree
+
+notes to self
+- explicitly document label position at top-left corner

unix/label.c

@@ -38,7 +38,7 @@ uiLabel *uiNewLabel(const char *text)
 		FALSE, FALSE, onDestroy, l,
 		"label", text,
 		"xalign", 0.0,		// note: must be a float constant, otherwise the ... will turn it into an int and we get segfaults on some platforms (thanks ebassi in irc.gimp.net/#gtk+)
-		// TODO yalign 0?
+		"yalign", 0.0,
 		NULL);
 
 	l->widget = GTK_WIDGET(uiControlHandle(uiControl(l)));