Bug 7718 - Remove itemnumber column from serials table

Bug 7718 - Remove itemnumber column from serials table

Remove the column 'itemnumber' from the table 'serial'. This is
a 1 to many relationship, and this reference does not make sense.
The 'serialitems' table handles the relationship between the 'items'
table and the 'serial' table.

Test Plan:
1) Apply patch
2) Run updatedatabase.pl
3) Verify serial.itemnumber has been removed from the database

Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
Column removed. No errors.

Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>