0.4.5
  - Ported to 2.6 kernel and idle-halt checks /proc/interrupts more precisely
    to avoid improper shutdown.

0.4.4
  - fix a bug in Makefile

0.4.2
  - new APIs, easier to use than binary format, used by fftv
    FILE *tcrontab_update_open(char *apId);
    void tcrontab_update_append(FILE *fp, char *text);
    void tcrontab_update_close(FILE *fp);

0.4.1
  - Run the job at ??:??:00. (the beginning of a minute)
  - execl should be terminated with a NULL

0.4
  - Add application program interface
      1. AP doesn't have to write the parser itself. AP can retrieve/update
         its own tcrontab entries only.
      2. All of the crontab access is protoected by 'tcrontab-ap'.

0.33
  - Fixed at job bug. Tcron incorrectly remove at jobs.
  - Tcron will invoke user's login shell to execute cron jobs to avoid
    PATH and environment variables problems.
