Observables ids

Hi Sam,

I'm sorry, but all of the current developments are on the same branch:

Please have a look at slhalib.py . This is quite nice now. I checked that initialising SLHA(lookup) is fast :)

I also had a go at implementing all the bloody mc-constraints. I agree that we should make different files for different users, but we can do that later..

On the front end you'll see some utilities, each of which starts with test_… .py You can use this for testing.

One mayor BUMMER: I discovered that we were using the SMObs[…] from susypope. 
I changed this to MSSMObs[], and depressingly, it's far off, (wich was easy to note, because most observables give humongous errors).
So Monday the first thing on the list is fixing SUSYPOPE :( 

Anyway, apart from that, I implemented most of the changes that we discussed when we went over the pull request.

I think the developments are fit to be merged into the master branch:)

I'm happy to go over the changes, like we did last time on Monday, if you prefer that. Otherwise have a look and you can merge it.

Cheers,
Kees