replace filter_cels by split_caller_callee_cels
use callee_cel_interpretor
extract and rename CELInterpretor to CELDispatcher
add interpret_cels to CalleeCELInterpretor (through base class)
add interpret_cel to CalleeCELInterpretor (through base class)
fill {source,destination}_line_identity
rename caller_cels to cels in AbstractCELInterpretor
Merge '4205-history-performance-3'