0.16

Add support for extension packages that add hooks and commands.
Significantly improve nick tracking.
Globally rate-limit message sending to prevent excess floods.
Use extended-join and account-notify for better admin authentication.
Automatically migrate config file on upgrades.
Validate groups.cfg on upgrade.
Add underscore, paraphrase, translate and randtranslate filters.
Allow filters to be set per-channel.
Improve message truncation and splitting.
Lock the output dir for parselogs/parsedata to prevent race conditions.
Log topic changes properly.

Issues Fixed: #473, #553, #766, #789, #823, #827, #862, #942, #996, #1015, #1033, #1039, #1050, #1068, #1076, #1092, #1096, #1099, #1101, #1104, #1117, #1122, #1123, #1126, #1128, #1130, #1132, #1135, #1138, #1142, #1152, #1155, #1159