Bug 5377: widen columns to better accommodate multiple ISBN and ISSN

Bug 5377: widen columns to better accommodate multiple ISBN and ISSN

Test Plan:
1) Apply this patch
2) Create a record with 5 ISBNs and 5 ISSNs
3) Create a new report from the following SQL, or execute it from the
   mysql console:
   SELECT isbn, issn FROM biblioitems ORDER BY biblionumber DESC LIMIT 1
4) Note that all your ISBNs and ISSNs are listed, separated by the pipe
   character ( | )

Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>
This might be slow to run on big databases, because of the 2 index
rebuilds, however it changes no functionality just increases the field
size which is safe enough (we store multiple now already)

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