Make URL support for loading prefs explicit in ui. Improve error message on failed URL prefs load. Fix URL prefs loading.

Fix bug where top/bottom of screen windows could go fullscreen, leading to crazytimes. Fixes bug 1265

Fix bug where white rectangle appears briefly on right side of new tabs in Lion with overlay scrollbars. Fixes bug 1291.

Some code hygiene

The warnings are generated because GCC 4.2 didn't know of which type the
object from the array was, and it guessed that it was some object which
returns an NSString *, which cannot be cast to PTYTab * without warning.

PseudoTerminal#closeTabContextualMenuAction

comparison

the correct protocol

Fixes warning when setting the delegate of a PTYTabView to a
PSMTabBarControl, which correctly implements PTYTabViewDelegateProtocol,
but the correct override for setDelegate was missing in PTYTabView.

Fixes a warning when assigning PseudoTerminal as the delegate for [self
window]; inside

(id)initWithSmartLayout:(BOOL)smartLayout windowType:(int)windowType screen:(int)screenNumber

makeMainWindow is required when the terminal is in another space for steal focus to work

Implemented that the Terminal stays at the bottom when resizing/ creating normal window at the bottom

added a StealFocus escape code: ESC]50;StealFocus^G

This is able to be activated using
echo -e -n "\033]50;StealFocus\007"