Natural-Selection 2

Some more Natural-Selection 2 patches hit Steam, fix stuff but also break stuff. Such is an alpha. Notes after the break.

Technical
# Changed collision detection to use the Havok engine
# Optimized trace ray and sweep capsule tests
# Fixed bug where keys could get stuck down after a frame hitch
# Fixed bug where players could not be removed from the scoreboard after they left the game
# Fixed bug where bots would not be properly removed from the server
# Fixed crash on exit when trying to run the game without Steam running
# Fixed bug where particle systems weren't properly occlusion culled
# Fixed hardware cursors not being properly released on shutdown
# Fixed bugs with the occlusion culling system not properly determining if something is visible
# Changed the "Couldn't Connect" error message to be more descriptive
# Added net_messages console command to log network messages received
# Added r_gui console command to enable/disable drawing the GUI
# Added the ability to include PROFILE markers in script code
# Added support for Lua GUIs on models (i.e. ammo display on the Rifle)

Gameplay
# Completely re-did marine, alien and "shared" (waypoints, chat, death messages, etc.) interfaces in Lua (was in flash). You should see noticeable frame-rate improvements.
# Added very basic bots for load testing ("dev 1" at server, "addbots #" or "removebots #"
# Armory "buy" menu fully client-side now so it's much more responsive
# Hydras now build smoothly
# MACs and Drifters now cost energy to produce (further eliminating spam and overly simplistic defense)
# Sentries turn off completely without power
# Power nodes have almost-dead and dead electricity/sparking effects
# Reduced number of network messages and footstep sounds dramatically
# Networking optimizations
# Power nodes work on level change
# Structure flinch animations fixed
# Changing weapons as marine is now faster and more reponsive
# Added basic pathing for bots (when commanding)
# Fixed MAC welding effects
# Skulk leap now requires research (on the Whip, coming soon)
# Fixed "doubling up" of some sounds

Also, here's the changelog from the previous version which we released previously (Build 153):

Technical
# Fixed the net_lag console command
# Fixed the player limit on servers
# Fixed bug where the server could send two updates with the same time
# Fixed bug where attempting to connect to a nonexistent server would not properly fail
# Fixed issue where time would not advance uniformly on the client causing motion to appear jerky
# Fixed bug where disconnecting and then reconnecting to a server could put the game in an incorrect state
# Fixed bug where clients sometimes couldn't move when when connected to a server
# Added support for extrapolation past the last update from the server
# Added a timeout for authenticating with the Steam servers
# Added displaying the average server tick rate with the net_stats console command

Gameplay
# Fixed problem where infinite MACs and Drifters could be built and cause problems (now limited to 25 units in an area)
# Fixed power node in tram marine expansion
# Power nodes can be repaired properly again
# Fixed extractor multiple upgrade bugs
# Fixed hive sight drawing incorrectly
# Fixed sentry accuracy problems
# Fixed lowered server CPU performance when using sentries
# Fixed problem with power nodes on map reset
# Fixed missing text tooltips for commander UIs
# Fixed build harvester problem from gestate menu
# Fixed death message weirdness
# Fixed ns2_junction minimap
# Changed power nodes to pulse red when out of power (makes it more obvious)