Level to numeric field

[elarlang]

Proposal to make level to numeric field was already in #1022 and agreed in #1022 (comment) and #1022 (comment).

The topic was raised again in #2555

[elarlang]

ping @tghosth - can I move on with that?

Most likely it breaks export scripts, but I don't think it is a problem at the moment.

It affects quite many scripts from my side so I would like to move on to new format.

[tghosth]

can we wait until we are ready for the releveling? or would you prefer to change the format without releveling and then change the levels afterwards?

[elarlang]

Just a hint - for releveling it is easier to change number than put correct amount of check signs to correct place.

I can see it as independent task that can be done in any moment, but for every scripts that need to work in the future it is better that this change is done.