Bug 5458: increase ccode column to varchar 80

Bug 5458: increase ccode column to varchar 80

Koha allows you to define an authorised value having length 80, but then you
can't use it.

Here is why:
The SQL field items.ccode is a varchar(10).
The SQL field authorised_values.authorised_value is a varchar(80).
Therefore the authorised value is truncated to length 10 in items.ccode and the mapping from authorised value to description string fails in Koha.

This patch increases ccode column to varchar 80, like location.

Test plan :
1) Dont apply patches
2) Check there is on item field a subfield with authorised value category CCODE
3) Check this subfield is linked with database column items.ccode
4) Create an authorised values in category CCODE with 'DOCUMENTATION'
5) Edit an item on ccode and choose 'DOCUMENTATION'
6) Save item
7) Look at items.ccode in database or export in MARCXML
8) The value is troncated to 'DOCUMENTAT'
9) Apply patches and update database with installer/data/mysql/atomicupdate/bug_5458.sql
10) Repeate step 5 to 7
11) The value is not truncated 'DOCUMENTATION'

Signed-off-by: Michal Denar <black23@gmail.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>