Add the CEILING alias for the CEIL function

iwis

I propose to add the CEILING alias for the CEIL function.

The CEILING function is in ANSI SQL Standard, PostgreSQL, MySQL, and SQL Server.

Scalar SQL functions differ quite significantly among RDBMS. This step will reduce this difference. Other changes in RDBMS proposed by me are here: https://github.com/iwis/SQL-notes/blob/master/Functions_proposed_changes.md

ShankarS-Oracle

SQL Macros of type SCALAR make this possible in Oracle Database 21c onwards,i believe.