[KPhotoAlbum] Patch to accept index.xml file with some default data

[Robert Krawitz]

These two patches:

1) Accept an index.xml file with missing data assigned default values:

   - Label defaults to the basename of the file name
   - Angle defaults to 0
   - End date defaults to start date

2) Writes an index.xml file with that data omitted if the default
   values are correct.

This yields about a 22.5% reduction in the size of my compact-format
index.xml file (from 65675111 to 50905302 bytes).

I'm offering these patches more for purpose of discussion than for
actually being integrated.  Patch 1 is fully compatible, but patch 2
obviously is only forward compatible.

As for another problem I had, where I needed to change the name of the
database driver from QSQLITE to QSQLITE3, that issue seems to have
gone away.  I assume it was a mixup with the Qt packages from my
distro.
-- 
Robert Krawitz                                     <rlk at alum.mit.edu>

***  MIT Engineers   A Proud Tradition   http://mitathletics.com  ***
Member of the League for Programming Freedom  --  http://ProgFree.org
Project lead for Gutenprint   --    http://gimp-print.sourceforge.net

"Linux doesn't dictate how I work, I dictate how Linux works."
--Eric Crampton
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