small changes to get linalg over ZZp back to status quo
added to/from bigComplex, which was missing, and caused new code to fail
Forgot to add new file
Changed interface to function not yet being used.
promote between RRR and CCC now works
Added "lift" structure to match "promote".

Still need to add most of the actual lift routines.
removed aring-promoter in favor of aring-translate.
ARingCCC tests match ARingRRR tests; bug in ARingCCC::divide fixed
arithmetic18446744073709551557 test for ZZpFlint now passes on a 32bit system