Always try to send up to the WINDOW_SIZE, even if there were errors.
Allow for auto-updating framework library version values in release process.

Looks for a LIBRARY_VERSION constant in the "base" library file. So e.g.,
a framework library named Horde_Foo, the file lib/Horde/Foo.php would be
searched for a LIBRARY_VERSION constant and updated to the current
version of the library.