[FIX] cart: Recalculate inventory level as everything gets removed from the on-hold list just above this line before being re-added just after (probably could be significantly optimised but at least everything can be sold now)

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@49738 b456876b-0849-0410-b77d-98878d47e9d5
[REF] cart: Simplify and modernize the addtocart plugin some, more to come

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@49739 b456876b-0849-0410-b77d-98878d47e9d5
[MOD] Adding command to send new notification digests

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@49740 b456876b-0849-0410-b77d-98878d47e9d5
[ENH] Document the command to execute as a cron job, make the 'High' priority optional as set-up is required

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@49741 b456876b-0849-0410-b77d-98878d47e9d5
[MRG] Automatic merge, branches/12.x 49729 to 49739

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@49742 b456876b-0849-0410-b77d-98878d47e9d5
[FIX] Remove debug info

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@49743 b456876b-0849-0410-b77d-98878d47e9d5