erts: Do some refactoring in erl_db_catree.c
erts: Do some refactoring in erl_db_catree.c

Fewer variables with shorter names

and prefer DbTableCATree over DbTableCommon.

vladdu/otp,uabboli/otp,legoscia/otp,kvakvs/otp,RoadRunnr/otp,aboroska/otp,dumbbell/otp,emacsmirror/erlang,dgud/otp,vinoski/otp,bjorng/otp,potatosalad/otp,dumbbell/otp,bjorng/otp,erlang/otp,RoadRunnr/otp,getong/otp,electricimp/otp,lrascao/otp,aboroska/otp,g-andrade/otp,g-andrade/otp,isvilen/otp,lrascao/otp,isvilen/otp,bsmr-erlang/otp,g-andrade/otp,emacsmirror/erlang,bsmr-erlang/otp,RoadRunnr/otp,dumbbell/otp,dgud/otp,emacsmirror/erlang,vinoski/otp,rlipscombe/otp,jj1bdx/otp,vinoski/otp,erlang/otp,lrascao/otp,mikpe/otp,bjorng/otp,jj1bdx/otp,erlang/otp,g-andrade/otp,g-andrade/otp,bsmr-erlang/otp,dumbbell/otp,bsmr-erlang/otp,getong/otp,aboroska/otp,potatosalad/otp,dgud/otp,aboroska/otp,isvilen/otp,RoadRunnr/otp,isvilen/otp,kvakvs/otp,vladdu/otp,rlipscombe/otp,getong/otp,ferd/otp,vladdu/otp,aboroska/otp,isvilen/otp,vladdu/otp,potatosalad/otp,aboroska/otp,emacsmirror/erlang,jj1bdx/otp,mikpe/otp,uabboli/otp,g-andrade/otp,lrascao/otp,emacsmirror/erlang,kvakvs/otp,legoscia/otp,erlang/otp,getong/otp,jj1bdx/otp,bsmr-erlang/otp,mikpe/otp,potatosalad/otp,aboroska/otp,lrascao/otp,isvilen/otp,kvakvs/otp,erlang/otp,rlipscombe/otp,bsmr-erlang/otp,electricimp/otp,bjorng/otp,vinoski/otp,bjorng/otp,rlipscombe/otp,ferd/otp,vladdu/otp,dumbbell/otp,lrascao/otp,lrascao/otp,dumbbell/otp,erlang/otp,dumbbell/otp,electricimp/otp,dgud/otp,getong/otp,isvilen/otp,bjorng/otp,g-andrade/otp,dumbbell/otp,dumbbell/otp,potatosalad/otp,ferd/otp,aboroska/otp,legoscia/otp,vladdu/otp,uabboli/otp,ferd/otp,erlang/otp,g-andrade/otp,uabboli/otp,vinoski/otp,bsmr-erlang/otp,legoscia/otp,potatosalad/otp,emacsmirror/erlang,dgud/otp,erlang/otp,vinoski/otp,isvilen/otp,bjorng/otp,kvakvs/otp,erlang/otp,dgud/otp,electricimp/otp,mikpe/otp,rlipscombe/otp,legoscia/otp,RoadRunnr/otp,jj1bdx/otp,dgud/otp,potatosalad/otp,mikpe/otp,RoadRunnr/otp,getong/otp,getong/otp,lrascao/otp,potatosalad/otp,uabboli/otp,rlipscombe/otp,getong/otp,lrascao/otp,jj1bdx/otp,ferd/otp,dgud/otp,mikpe/otp,dumbbell/otp,mikpe/otp,kvakvs/otp,jj1bdx/otp,vinoski/otp,dgud/otp,vladdu/otp,g-andrade/otp,vinoski/otp,electricimp/otp,dgud/otp,getong/otp,kvakvs/otp,emacsmirror/erlang,rlipscombe/otp,kvakvs/otp,potatosalad/otp,ferd/otp,electricimp/otp,ferd/otp,RoadRunnr/otp,bsmr-erlang/otp,RoadRunnr/otp,rlipscombe/otp,jj1bdx/otp,vladdu/otp,bjorng/otp,emacsmirror/erlang,uabboli/otp,isvilen/otp,electricimp/otp,aboroska/otp,getong/otp,electricimp/otp,ferd/otp,emacsmirror/erlang,uabboli/otp,mikpe/otp,jj1bdx/otp,bjorng/otp,vinoski/otp,rlipscombe/otp,uabboli/otp,electricimp/otp,mikpe/otp,vladdu/otp,legoscia/otp,legoscia/otp,uabboli/otp,jj1bdx/otp,kvakvs/otp,emacsmirror/erlang,ferd/otp,bjorng/otp,potatosalad/otp,legoscia/otp,bsmr-erlang/otp,RoadRunnr/otp,rlipscombe/otp,legoscia/otp,mikpe/otp,g-andrade/otp,vinoski/otp,erlang/otp,isvilen/otp