Logging

[AEL-H]

minor tweaks to code involving logging changed error print statements to print to stderr instead of stdout so they can be separated

[x0range]

Merge conflicts with previous state of master branch

[AEL-H]

The conflict is that in logging I deleted an obsolete function replication_log_prepare_oneriskmodel(). It would simply call another function. If we delete it, we will get an error saying the function doesn't exist and we can correct the code in-place. In replication_log_prepare(), there is an option "one" for the one risk model anyway.