[Halla12_software] SoLID standard layout

[Zhiwen Zhao]

Dear Collaborators

In an effort to produce standard SoLID layout plot and help designing 
supporting structure for various component, I summarize the current 
layout here
https://hallaweb.jlab.org/wiki/index.php/Solid_Detector_Dimension
The wiki page should serve as a central location for future updates.

Please let me know any comment.

Thanks

Zhiwen