[sane-devel] demo patch for SANE 1 / SANE 2 coexistence

[stef]

	Hello,

	in order to demonstrate the possibility to have SANE 1 and SANE 2 coexisting 
by using meta backends, here's a demo patch against recent CVS which:
	- raise V_MAJOR to 2
	- add a sane1 meta backend that loads backends with a so major of 1 to
	  allow SANE 2 frontends to use SANE 1 backends
	- add a sane2 meta backend with a so major of 1 but searches for backends
	  with a so major of 2. It also handles the warming up status, and detects
	  use of newer frame formats. So a SANE 1 frontend would be able to use a
	  SANE 2 backend.

	So even after an installation of SANE 2 packages:
	- SANE 1 only backends such as binary one can still be used 
	- SANE 1 frontends can use SANE 2 backends
	This let package maintainers to upgrade at their will and/or when frontends 
get updated to take advantage of new features. Custom or binary frontends 
won't need to be updated.

Regards,
	Stef
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