Addresses Issue 1348 and Issue 95

Not done, yet, but available for developers to use.

Definite things to be done in the short term:
1) Allow user to hide canned searches in Accounts Activity
2) Make newly arrived mail immediately appear in search results.

Possible improvements:
3) User-definable searches
4) Make newly deleted mail immediately disappear search results.
5) Make message with flag changes immediately appear/disappear from
   search results.
6) Show search result size in Accounts Activity.