Mercurial: Work on Windows using Tortoise Hg, polishing.

Do not use "cmd /c hg" on Windows as this will fail randomly
depending on arguments with blanks, such as "-U 8". Output log
messages about synchronous commands, format author correctly,
label menus correctly.

src/libs/utils/winutils.h

@@ -47,5 +47,10 @@ enum WinDLLVersionType { WinDLLFileVersion, WinDLLProductVersion };
 QTCREATOR_UTILS_EXPORT QString winGetDLLVersion(WinDLLVersionType t,
                                                 const QString &name,
                                                 QString *errorMessage);
+
+// Return the short (8.3) file name
+QTCREATOR_UTILS_EXPORT QString getShortPathName(const QString &name,
+                                                QString *errorMessage);
+
 } // namespace Utils
 #endif // WINUTILS_H