Bug 10861: Add a check on cardnumber length

Bug 10861: Add a check on cardnumber length

Some libraries would like to add a check on the cardnumber length.
This patch adds the ability to restrict the cardnumber to a specific
length (strictly equal to XX, or length > XX or min < length < max).
This restriction is checked on inserting/updating a patron or on importing
patrons.

This patch adds:
- 1 new syspref CardnumberLength. 2 formats: a number or a range
  (xx,yy).

- 1 new unit test file t/Members/checkcardnumber.t for the
C4::Members::checkcardnumber routine.

Test plan:
1/ Fill the pref CardnumberLength with '5,8'
2/ Create a new patron with an invalid cardnumber (123456789)
3/ Check that you cannot save
4/ With Firebug, replace the pattern attribute value (for the cardnumber
input) with ".{5,10}"
5/ You are allowed to save but an error occurred.
6/ Try the same steps for update.
7/ Go to the import borrowers tool.
8/ Play with the import borrowers tool. We must test add/update patrons
and the "record matching" field (cardnumber or a uniq patron attribute)

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Tested adding, updating; importing and ran unit test.
Preliminary QA comments on Bugzilla

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>