[Clas12_rich] spherical mirrors

[Marco Mirazita]

Hi all,
I have updated the wiki page (RICH construction) with the passports of 
the mirrors delivered few days ago, which are mirror 3 and 4.
I'have been informed that next two mirrors should be sent out today and 
last two by august 15.
It means next week we can measure with the CMM 4 mirrors.
For last two, we should arrange sometime later.
Marco