MGM memory warning

[oleg-alexandrov]

The warning "Warning: Estimated maximum memory consumption is 20128.0mb but only 9878mb of free memory is detected. To lower memory use, consider reducing the number of processes or lowering --corr-memory-limit-mb."

produced by stereo with the asp_mgm algorithm seems bogus. Normally MGM does not use as much memory as this says, and the system memory also does not appear guessed right. To be looked into. It is overall harmless and the suggestion of modifying the number of processes and memory limit is a good one.