[PATCH][RFC] cache generation + separate FDI parser process

[Sergey Lapin]

Hi!

Attached is a patch which provides these improvements:

- Separates XML parsing from main running process thus reducing memory 
fragmentation and consumption.
- maintains binary cache which is mmapped for reading thus not using 
heap for that, so it uses mapped memory which is freed on demand which 
is good for small-memory embedded devices.
- makes hald smaller due to fact that bunch of rarely used code is out 
in separate process.

so you get /usr/sbin/hald-cache which generates cache at /var/run/hald 
(for example) which is then used by hald, so it must exist prior to 
running hald.

Debug scripts are not changed, they need to be added running of that binary.

It was a lot of work and it could not be done without Mikhail 
Kshevetskiy who did great job of fixing and rewriting lots of crappy 
code when my head was seem to blow with that a bit unnecessary 
complicated parts of code, so we made it far more simpler and solid.

Hope that will be useful.

Possible TODO:

move hald-cache-test to noinst
provide check for cache to be consistent with FDI files (newer).

S.
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