The old internal storage format was:
::__:SAVEBUFF:__::<buffer lines>
The new storage format for channels:
::__:CHANBUFF:__::<buffer name>
<buffer lines>
The new storage format for queries:
::__:QUERYBUFF:__::<buffer name>
<buffer lines>
See #802 for details why the storage format had to be changed. Reading
the old storage format is still supported so old saved buffers load as
appropriate.