----------------------------
revision : 0.55
date : 2008/9/24 13:22:05
add serialize feature
----------------------------
revision : 0.50
date : 2008/6/19 16:06:20
add delete_on_error and exit_on_error parameter 
----------------------------
revision : 0.48
date : 2008/6/16 15:00:42
add UNSHIFT feature
----------------------------
revision : 0.38
date : 2008/4/11 13:05:33
add MODE creation for the DB file when tying
----------------------------
revision : 0.37
date : 2008/4/11 10:28:15
add SPLICE feature
----------------------------revision : 0.36
date : 2008/4/10 18:56:37
first full functional version
----------------------------