filter: implement saving of presets to XML file

Users might want to move their presets with there log-file. Therefore,
save the presets to the log. The alternative would be to save them
to the preferences. However, on the mailinglist it was decided that
moving the presets to a mobile device is a wanted feature.

The XML saving code has a rather reasonable interface, therefore
this turned out to be pretty easy to implement.

The filter presets are saved into a
<filterpresets>
 ...
</filterpresets>
block

Each individual preset is saved into a
 <filterpreset name='...'>
    ...
 </filterpreset>
Block with a unique name attribute.

Each preset contains zero or one fulltext and zero or more constraint entries.
The type and mode(s) are controlled by attributes, the "payload" is saved in
the block. Note that all the formatting is done by functions in core/filterconstraint.c
and not the parser itself.

A preset in the XML file might look like this:

 <filterpreset name='test1'>
  <fulltext mode='startswith'>Train</fulltext>
  <constraint type='planned'>0,0</constraint>
  <constraint type='sac' range_mode='range' negate='1'>5000,10000</constraint>
 </filterpreset>

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

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