Comment 1 for bug 514303

I found it necessary to make 3 changes:
1. The 2 digit string for the current month was obtained incorrectly.
2. FIlling the line buffer with blanks was going 1 character too far.
3. Some strcat() operations exceeded the length of the log_line[4] buffer, so it was made longer.

With these changes, tlf will start, and accept callsign entries.