Modifies ID computers to allow opening additional positions for latejoiners. Very restricted at the moment to test how it's used by the playerbase

See http://forums.nanotrasen.com/viewtopic.php?f=16&t=12490&p=195140#p195140 for details
Re-enabled closing original positions with a cooldown
Added logic checks to my stuff in topic() so you can't bork the server by griefing with byond://?src links
Forgot to remove a testing-output
Made the effects of EMP pulses get garbage collected. Less lag on the singularity (around 20 effect del per 5~10 seconds)
Committing Elo001's job management stuff.

I made some very minor modifications (mainly tidied up the code a little bit so it's easier to read/modify).

I have made it so opened_positions can be negative. This means that reopening original positions, which were just closed, no longer requires an annoying cooldown period.

Removed the "AI" "Cyborg" "Assistant" checks since they were already handled within the blacklist.

The can_close_job and can_open_job procs now return codes for different reasons for failure (this removed a little bit of code duplication)

Nice work for a first commit, Elo :3
Merge branch 'master' of github.com:tgstation/-tg-station into Upstream
Updated MetaStation v22E.dmm to Metastation v23C.dmm
- Fixed atmos freezing issue
- Added Ian again
- Added second dispenser in chemistry
- Fixed a few cabling/plumbing issues, should be perfect again
- Changed firelocks, they are under almost all normal doors now.
- A few other fixes and adjustments

The first playtest went well other than the horrific freezing bug. So this is good.
Image of the full map: https://dl.dropbox.com/u/858120/Static/SS13%20Map%20Thread/13-03-13%2020-49%20MetaStation%20v23C.dmm
Post comments here:
http://forums.nanotrasen.com/viewtopic.php?f=15&t=12562&p=197557#p197557
Merge pull request #48 from aranclanos/master

EMP effects get garbage collected
Merge pull request #50 from Metacide/master

Updated MetaStation v22E.dmm to Metastation v23C.dmm
Merge branch 'master' of https://github.com/sawu-tg/-tg-station