Tooltron

Revision cc7646f9

Major changes to mainbox code.

-Added local cache for RFID -> tool permissions
-Queries new page /crm/roboauth/%08x, which gives bitmask of all tool
permissions instead of just one
-Added pid file at /var/run/tooltron.pid
-Now must be run as "tooltron run" and also has "tooltron refresh" and
"tooltron clear" which send signals to the pid in the pid file
-Other things I'm forgetting

void log_perror(const char *s) {

  log_time();

  perror(s);

  printf("%s: %s\n", s, sys_errlist[errno]);

}

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