Idle fixes

- add new wglobaldefaultspathfordomain() to wings (replaces several
  hand-rolled individual implementations in utils/)
- make all of 'em handle -h|--help, -v|--version
- try making them not to nothing silently
- change various ways of knowing thyselves to using __progname
- generally try to make them feel similar (NOT right, similar --
  right is a completely different matter)

WINGs/WINGs/WUtil.h

@@ -298,6 +298,7 @@ WMRange wmkrange(int start, int count);
 char* wusergnusteppath();
 
 char* wdefaultspathfordomain(char *domain);
+char* wglobaldefaultspathfordomain(const char *domain);
 
 void wusleep(unsigned int microsec);