remove name check constraints on circ rule tables

[Galen Charlton]

The following tables have check constraints in place restricting names to word characters only (no spaces):

config.hard_due_date
config.rule_age_hold_protect
config.rule_circ_duration
config.rule_max_fine
config.rule_recurring_fine

This was meant to allow JavaScript circ policy scripts to refer to rules using object notation instead of associative array notation (e.g., foo.bar instead of foo['bar']). However, with the prospective de-support of circ scripts some time after 2.1, removing the check constraint would allow more descriptive names. In particular, at least one user is known to have wanted to be able to use something like 'Foo End Of Term' as the name of a hard due date rule.

[Jason Etheridge (phasefx)]

http://svn.open-ils.org/trac/ILS/changeset/19203