bug 2000 - add total loan limit to alt. issuing rules

bug 2000 - add total loan limit to alt. issuing rules

The alternate issuing rules editor can now allow
defining the maximum number of loans that a borrower
of a given category can take out per branch, regardless
of item type.

The form for entering this limit now appears below
the form for setting loan rules per patron category
and item type.  The form only appears if a specific
branch is chosen, not if the default branch is used.

Also, some terminology changes:

* "Amount Loanable" => "Current Checkouts Allowed"
* "Amount" => "Fine Amount"
* "Grace Period" => "Fine Grace Period"
* "Charging Interval" => "Fine Charging Interval"
* "Loan time" => "Loan Period"

Documentation change: new screenshots for the alternate
loan rules form.

squashme terminology

Signed-off-by: Joshua Ferraro <jmf@liblime.com>