wish: configurable layout for home/summary page

[Jeff Fortin Tam]

All my screens are widescreen (16:9, 16:10, or 21:9) but Homebank unfortunately doesn't leverage this aspect ratio. This is particularly noticeable with the main window, the "Accounts summary" that shows up when you start the application: I have a lot of accounts and a lot of recurrent transactions, and Homebank is making the two views scroll vertically while there is also a ton of available, "wasted" space on the sides. See attached screenshot.

See also: http://fortintam.com/blog/2011/06/24/dont-make-me-scroll/

Proposed approach:

1. When Homebank detects* the screen has a much bigger width than height,
2. If the "top spending" pane is disabled by the user,
3. Have the accounts list and the recurring transactions list widgets in two vertically scrollable areas side-by-side instead of two horizontally scrollable areas.

*: the blog post above also has a link to some example code/commit that will tell you know how to measure this easily with GTK.

Thanks!