[Cocoapsql-developer] Commit: splitViews; queryHistory draggingSource behavior

[Olaf v. O. <ol...@ad...>]

added splitViews to the Query window:
will add later
- means to alter and save users preferred behavior of the querySpace and 
queryHisrory views.
- saving and restoring window settings on quit and startup

prepared queryHistory (now a PSQLTextView) for being a draggingSource 
when saving queries to a document.
On mouseDown the query under the mouse pointer is selected
On mouseDragged the selected query is copied to the pasteboard. An image 
representing the selection being dragged is shown under the mouse 
pointer.
will add later:
- the query being dragged must be of a custom "query"-type to distinct 
it from plain text. This to prevent the user from saving rubbish.
- multi document support: multiple Query windows, Query (history) 
documents to be saved and Db inspector windows.

Olaf