Remove a field from a table in a RelDataModel
remove_field(x, tableName, fieldName, rmForeignKeys = FALSE)
A RelDataModel
a RelDataModel
the name of the table to modify (a single character)
the name of the field to remove (a single character)
a single logical indicating if the corresponding foreign keys should be removed. If FALSE (default), the function will throw an error if it encounter a foreign key using the field.