Changes to the `Configurable` method `merge`
The changes applied to the merge method
were made as a result of code profiling
and result in a roughly 20-30s improvement
in some ATLAS trigger jobs.
An new test was added in
test_configurables_merge.py
as a result of changes made to merge in order
to increase test coverage.
Edited by Kacper Wojciech Topolnicki