Alexa, Kiwamu, Borja, Stefan

With the IMC locking reliably, and the input beam hitting the BS, we
- Found the good alignment for PRM and got the REFL beam centered on ISCT1.
- tweaked the PR2 alignment to get fringes in PRX (ITMY misaligned)
- locked PRX on the carrier and tweaked down the REFL power with PR2 and PRM.
- installed a camera looking down to HAM5 from HAM4. We could clearly find the beam on the Faraday cage.
- Using SR2 we steered the beam through the Faraday, and verified that it arrives in HAM6.

Attached is an alignment snapshot.

Remarks:
- while the input beam through IM3,IM4 and PR2 might still be going a bit up and down, after PR3 it should be pretty good (we didn't change the PR3, BS, ITMX and SR3 aligment (compared to alog 12816 )
- we didn't try to tweak the SRM yet.