Added class property pricerange

The absence of the property results in errors on line 590
Typo in comment
Prevent loop on empty array

Many messages show up in Shopp log due to undefined $taxrates, $settings when tax-settings have not all been set in Shopp admin. On installations 3 shopp-meta entries are added to database but they have no default value.
Set initial vaue for $labeling

If $label is empty an error will occur on line 962.
Merge pull request #3010 from lorenzocaum/1.3.x

For #3009. Correct spelling on province in Shopp content templates.
Preventing undefined array processing
Making sure $labeling has value
Fixed #2825 Moved taxable initialization above variant/addon rollups

Prevents recurrence of #2922 as well.
Closed #3011 Add ShoppShiprateService and item fees to shopp_shipping_fees filter hook
Fixed #2990 Removed explicit tax handling in feeds
Fixed #2976 Allow error capture and display in order lookup contexts
Fixed order lookup behavior to ensure error is shown if purchase doesn't exist or given email doesn't match the order
Merge pull request #3008 from Just-m/JM--2014-8-10

Code cleanup to prevent PHP NOTICEs in the logs