Fix `/services/reset`

I don't think anyone is using this, but it was broken - the `syncNow` function
doesn't take the `synclet` second argument anymore.
Make pcron-retasker reconcile tasks

Sounds like this won't be necessary soon because the tasks will all be
calculated dynamically, but in the meantime, this lets us refresh a wiped-clean
task list. Before, the script would error out with no tasks to modify.
Add a script to clear all data from a profile

When we're testing auth or otherwise clean-slate synclet runs, the current flow
is to wipe out everything in Accounts, Profiles and Entries. Then, you have to
go log back in to kick everything off again, your access token changes, and
worst of all, you had to touch the mouse.

This script blows away all IJOD entries, tasks and config data associated with a
profile, without deleting the profile itself (and its auth data). Go
nuts...locally.