Set an error message if a CMake configuration attempts to build Dakota without Pecos.
Set an error message if a CMake configuration attempts to build Dakota without Pecos.

Request review by Mike Eldred.



git-svn-id: dcef21d3ff4cbd8dced82702dcaad637bf246ecc@1204 aa0779c3-6ec2-4b84-a212-a405c134cd8d

pemryan/DAKOTA,pemryan/DAKOTA,pemryan/DAKOTA,pemryan/DAKOTA,pemryan/DAKOTA,pemryan/DAKOTA,pemryan/DAKOTA