Rename some variables for clarity.
Rename some variables for clarity.

mc   -> map
mb   -> reduce
old  -> omap
orig -> oreduce

zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb