Bug Fixing : overduenotices wrote a file on disk before sending to browser

Bug Fixing : overduenotices wrote a file on disk before sending to browser

this script had quite serious issues :
- it would not use mindays and maxdays variables
- It would send latin1 where utf8 was expected
- It would send data without text delimiters (; was chosen if title contains ; it would have been a problem " used as delimiters now)
- It would write a file when it was not asked
Now stores the results in a string before printing it.
New option added to store result into a file : -o filename

Signed-off-by: Joshua Ferraro <jmf@liblime.com>