[x]  1. cut down RAM usage
[x]  2. Date -> mtime
[x]  3. Replace trouble chars with _
[x]  4. use zero leading numbers. 
[x]  5. Take "From:" name with more sense - care: no "/"!
[x]  6. Use Content-Length to determine how much is in body.txt
[x]  7. Use Lines to determine number of lines in the body.txt
[ ]  8. highlighted file without .txt
[ ]  9. Option for zero-leading numbers.
[x] 10. Update man page
[ ] 11. Safe error if mailfile doesn't exist
