Fixes walk aborting prematurely

when we still have enough TUs but destination is tile after closed ufo
door.
experience points calculation
Ignore Xcode project/workspace user data
Fix Xcode build

* added OpenGL framework to libraries
* removed dubious header search path pointing to an absolute path
inside Xcode.app
MacPorts support for Xcode build

* added MacPorts library and include paths to search path
* updated build instructions in README to explain how to install
dependencies with MacPorts
use clearer icons for inventory template actions
Fix for Bug report#778

Reduce the bar's width from 170 to 150 so that they fit in the grid...
stereo sound functions
add melee stat to armour article
update invpaste_empty icon and allow apply empty
Merge pull request #905 from myk002/clarify_template_icons

Clarify template icons
Merge pull request #903 from GixG/patch-1

Fix for Bug report#778
fix inconsistent value
Merge pull request #1 from SupSuper/master

sync
radar stuff

correct some values, externalize others.
oversight: default isn't 0
minor optimization
Merge pull request #2 from SupSuper/master

sync
Fixed craft speed not matching UFO speed during dogfights.
Long names fix