This patch removes places-connection-closing, which is unused, reverts
1d1143dde4bb which was unnecessary and finalizes sql statements.
--HG--
extra : rebase_source : 8923378f4b1c58da8e128009efdf309f8ec29da3
Item list hidden behind expander/progressive disclosure button, added a warning when clearing all history, added a tree view for selecting a fine-grained timespan. We decided to remove the tree view at the last minute; code is still there but #ifdef'ed out.
r=mconnor