Condition number lost from response matrices when restarting

[David Dickinson]

If running with read_response=T and dump_response = T then when restarting a simulation we read in the response matrix from file and write it back to file. This currently loses the condition number information as we don’t restore this from file when reading the response and only calculate the response when inverting.

There are two changes we should make

1. Restore the condition number value when reading a matrix from file (not strictly needed as we don’t use it).
2. Don’t save the response matrix if we just read it in.

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[David Dickinson]

Should be addressed by PR #610

[David Dickinson]

Fixed in PR #610 for release 8.1.2