src/nickserv.c (msgtab): New entries for the "notes" command.
(cmd_notes): New function to show notes for an account.
(cmd_oset): Check access for subcommands.
(struct nickserv_discrim): New "fakehostmask" field.
(nickserv_discrim_create): Set it.
(nickserv_discrim_match): Check against it.
(init_nickserv): Register NOTES and OSET KARMA commands.
src/nickserv.help (SEARCH CRITERIA): Mention FAKEHOST and KARMA options.