Made FilesTreeWidget work

It wasn't as easy as I thought. Quite big changes:

1. I changed the query for setIds in FilesTreeModel. Initially it
executed a database query for every id. Changed it to WHERE
seriespart_id IN (ids). I didn't have a chance to test the first
version, but this one is blazing fast.

2. Fixed a recursio ad infinitum in FilesTreeModel. This happens if you
call data() from data(). Either use the *item or use a role different
from what you've been called.

3. Introduce a new function in SeriesTreeModel: QList<QVariant>
childrenColumnList. It returns a QList from the children values of the
given column.

4. Lot's of UI changes. Hide unneded columns, align the remaining ones
properly.

What doesn't work:
we can't let the database do the sorting of files. We need a proxy for
this.

1 files changed, 1 insertions, 1 deletions

diff --git a/smmodelsingleton.cpp b/smmodelsingleton.cpp
index d850c9d..08cbbba 100644
--- a/smmodelsingleton.cpp
+++ b/smmodelsingleton.cpp
@@ -46,7 +46,7 @@ QAbstractItemModel *SmModelSingleton::model(const QString &which){
 		}
 	}else if(which == "FilesModel"){
 		if(!mModels.contains(which)){
-			QStringList headers = QStringList() << tr("Name") << tr("P") << tr("Size") << tr("Q") << tr("DvdNo") << tr("Full Path") << tr("Size") << tr("Type") << tr("Md5 sum") << tr("Series part ID") << tr("File ID");
+			QStringList headers = QStringList() << tr("Name") << tr("Part") << tr("Size") << tr("Qual.") << tr("Dvd") << tr("Full Path") << tr("Size") << tr("Type") << tr("Md5 sum") << tr("Series part ID") << tr("File ID");
 			FilesTreeModel *model = new FilesTreeModel(headers);
 			mModels.insert(which, model);
 		}