Add a LET function into Calc for interoperability with MSO
Steps to Reproduce:
there is no a LET function in Calc
there is a LET function in Calc
User Profile Reset: No
I don't kwow if in this is needed a confirm, but I checked that it is not available in LO and it is available in MSO.
The implementation of the LET function will significantly expand the capabilities of the Calc formula language.