CRM-3014 Add user interface to allow activities to connect to multiple contacts

Testing this w/ r16218 - found a few issues:

• View Activity - you get a Javascript alert - "Request to hide() function failed. Undefined element id = assignee_contact_1_show"

• "With Contact" field value is being modified by postProcess from some contact (e.g. Zope or ...) to MY logged in user's contact record when I re-edit an existing Activity.

• "With Contact" field should not be frozen for any case - let folks edit it. It should still DEFAULT to the contact being viewed if New Activity is accessed from contact/view Activities tab.

assigning for verification

Found the following issues (testing on r16251)

Custom Fields for Activity :

• Values are not being saved to the civicrm_value_* table. To recreate:

• Create new Activity Type
• Create a custom data group extended that Activity Type
• Add a custom field - Data type = Integer, HTML type = Text
• Create a new activity of that type and enter a value in your custom field
  The value is not saved to the newly created table.

Activity Selector:

• Added by, With and Assigned To columns should be LINKS to the contact record (as in 2.0 and prior)
• For multiple With or Assigned To contacts - we show only the first contact in the selector which is fine - but we should let the user know that there are multiple contacts in that "role" by adding ... after the first contact name.

we're not distinguishing single from multiple contact on the selector for now to avoid additional query overhead.

Update of custom field data not working under some conditions. To recreate - follow these exact steps:

• Create new Activity Type

• Create a custom data group extended that Activity Type

• Add a custom field - Data type = Alphanumeric, HTML type = Radio
  -+ enter two multiple choice options: Yes (value = YesY), No (value = NoN)

• Create a new activity of that type and mark radio = Yes

• Edit same activity and mark radio = No

The value "NoN" is not saved - it is still "YesY"

NOTE: The behavior on this is a bit erratic. It seems like if I add a second custom field (type = Text) to the custom data group and then Update my Activity record - then the "NoN" radio value DOES save properly. Although on my second test of this case - it only worked on the second try ???

Can u do a bit of QA since u know the various cases

r18982. Verified previously reported bugs. Tested "Record Activities" (batch) from Find Contacts as well as singleton and standalone modes with custom activities and custom field.