Fix grammar to eliminate support for unary minus expressions -- they weren't supported, they aren't standard, and they caused expr to dump core.
Fix grammar to eliminate support for unary minus expressions -- they
weren't supported, they aren't standard, and they caused expr to dump
core.

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase