Sort the branches alphabetically when writing Frames

[tmadlener]

BEGINRELEASENOTES

• Make the collections appear in alphabetical order in root files, using a case insensitive sorting of the collections that are written.

ENDRELEASENOTES

As "requested" in AIDASoft/DD4hep#1108 (comment)

[jmcarcell]

Looks good, for consistency a similar thing should be done for the RNTuples

[jmcarcell]

Suggested change

	std::vector<std::string> sortAlphabeticaly(const std::vector<std::string>& input) {
	auto output = input;
	std::vector<std::string> sortAlphabeticaly(std::vector<std::string> vec) {

Alternatively, since it's making a copy anyway make it explicit by not passing by reference and changing the name to something else

[tmadlener]

Ah, yes. Excellent proposal. I always forget that this is a possibility for some reason.

[jmcarcell]

For the name change it's only to make it clear that it's not modifying the input although that can be seen in the argument; I don't have a strong opinion

[jmcarcell]

Probably worse since in the current way you only tolower the characters that you need to check

[tmadlener]

I agree on the RNTuple. Would it help to move the sortAlphabetically to root_utils already now, so that it is easier to reuse?

[jmcarcell]

Yes, already done I see :)

[tmadlener]

Waiting for #423 to be merged first, just to make sure that this doesn't break things accidentally.