1) I corrected a bug where -nopty had to be specified to get visit to work
   in client/server mode from a RHEL6 system. The pseudo terminal code on
   RHEL6 should have been using the SYSV pseudo terminal coding and instead
   was using the BSD pseudo terminal coding because stream support was
   discontinued in RHEL6. I modified the SYSV pseudo terminal coding to not
   use streams so that it could be used on RHEL6. This resolves #1375.

2) I modified the sidious config site files to use silo 4.9.



git-svn-id: http://visit.ilight.com/svn/visit/trunk/src@20449 18c085ea-50e0-402c-830e-de6fd14e8384