Implemented full cron format support types: NORMAL, SEQUENCE, PERIODIC. Strongly improved crontab implementation overr all.

Signed-off-by: Daniel (dmilith) Dettlaff <dmilith@verknowsys.com>
Updated tests code for new crontab implementation.

Signed-off-by: Daniel (dmilith) Dettlaff <dmilith@verknowsys.com>