ev: fix invalid fd check

ev: define EV_* constants instead of reusing POLL{IN,OUT} Dissociate us a bit from poll(2) so that we may even run on top of something else, and also allows to provide specific values for signal (EV_SIGNAL) and timers (EV_TIMEOUT).

import bufio from syncparty

test/evtest: invert order of timers registration

add some tests for multiple timers in ev

import ev.[ch] from syncparty and amused; locally tweaked to support an arbitrary number of timers.

hook telescope-identity.1

identity: few fixes Correct export usage; rename variable in cmd_mappings, allow to filter by identity name.

add telescope-identity.1

change default patch/diff colours to magenta and cyan red/green is not a great choice for diff colours: it's a bad combo for (some) colour-blind people, and they may also carry an implicit meaning of 'good' and 'bad', or 'ok' and 'not ok'. Instead, just like tog and gotwebd, use a combo of purple and cyan, which was choosen by a colour-blind user (I'm told).

draft of telescope-identity(1) This is intended to generate and manage certificates outside of telescope. Some operations are already available in the telescope UI, such as use and forget a certificate for a specific page, but generate and removal are hard at the moment to implement inside telescope limited UI, so provide an helper program for that.

catch fs_init() and certs_init() failures

return 0 on success (eventually -1 for failures)

sync changelog

net: improve error messages for connection failures