some changes in serial management :

some changes in serial management :
* in subscription Add, the issue number & date is used to calculate the 1st issue (previously, a "next issue number & date" was applied, meaning you had to enter the number & date of a previous issue)
* the "inner loop" used for serials number ({XYZ}) is now shown & can be modified. The innerloop is used for numbering formulas saying "change the number once every 4 times".