Set a unique number for each period

Signed-off-by: Suki <suki@missallsunday.com>
If we're enabling a period, its number must be set...

Signed-off-by: Suki <suki@missallsunday.com>
Someone could try to type the number's name...

Signed-off-by: Suki <suki@missallsunday.com>
Pedantic

Signed-off-by: Suki <suki@missallsunday.com>
Actually, lets use is_numeric()

Signed-off-by: Suki <suki@missallsunday.com>
Creating the "forever" option

Signed-off-by: Suki <suki@missallsunday.com>
Add the forever option

Signed-off-by: Suki <suki@missallsunday.com>
Edit Post.template.php too

Signed-off-by: Suki <suki@missallsunday.com>
Add the  forever option check before inserting the data

Signed-off-by: Suki <suki@missallsunday.com>