[Code Cleanup]
* [Web-API/Contexts/Custom Fields] The '/contexts/list.json' request in the Web-API now includes custom fields and fieldsets for each object context.  This is the recommended way to determine the available custom fields for a given record type.  Since all the available custom fields and fieldsets are returned in a single response, this can be efficiently cached by the client.
* [Web-API/Calendars] Calendar objects may now be filtered by owner during Web-API searches.
* [Web-API/Addresses] Address objects may be subtotaled by sender last name while searching in the Web-API.
* [Web-API/Addresses] The 'is_defunct' field may be set on address objects in the Web-API.
* [CHD-3756] [Mail/Parser] Fixed an issue with Outlook calendar attachments.  Previously, these attachments had no filename.  Now they're given a default of 'calendar.ics', which can automatically open them in programs like Outlook and Apple Calendar.
* [CHD-3736] [Custom Fields/Usability] URLs in text-based custom fields will now be automatically hyperlinked when displayed on worklists or profiles.
* [CHD-3735] [Profiles/Custom Fields/Usability] Multiple-line custom fields displayed at the top of profiles now offer an 'expand' option to display their entire contents with preserved whitespace and hyperlinked URLs.
* [CHD-3746] [Setup/Workers] When editing worker records in configuration, whitespace is removed in email addresses.  Previously, a misplaced space at the end of an email address would prevent a worker from being able to log in.
6.7.3-dev checkpoint
* [Setup/Community Portals] Fixed an issue when configuring Community Portals where the 'Installation' tab could should the wrong port.  This was using the current server's port, which may be a PHP application server behind a load balancer.  Now the Devblocks URL service is used to detect the port in the public URL.
[Code Cleanup]
6.7.3-release
Merge branch '6.7.3' into stable