[URC] urchub support scripts for tor and curvecp
clarity
[urcd.pyx] faster string handling (thanks SeekingFor)
[src/urchubstream.c][security] use LIMIT before first sendto operation
[src/urcd.pyx][security] env/URCSIGNSECKEYDIR (use different keys per dst)
[src/urcd.pyx] bugfix
[src/urc2sd.pyx] BAN/EXCEPT bugfixes (thanks Tempest)
[Make.sh] chmod +x (thanks lulzPrincess)
[src/urcd.pyx][security] parse fixes, added env/URCSIGNPUBKEYDIR for storing dst/src kvp's for verification lookup
[urcd.pyx] bugfix
[urcd] bugfixes and some clarity
[urcd] bugfix
[urccache.c][security] safe bootstrap for protocols using cryptography