rinetd 0.63

Summary of changes:

• added a -f flag to run in the foreground
• quit cleanly when SIGINT is received
• increased data buffer size for better performance
• fixed random uninitialised data accesses
• fixed a memory leak in connection reallocation
• fixed a file descriptor leak in configuration reload
• fixed configuration file parsing (many bugs including a buffer overflow)
• fixed configuration error reporting (line numbers were wrong)
• log accepted connections in addition to denied ones
• log DNS errors
• code quality refactoring: got rid of a lot of old code, used C
  library functions instead of custom ones, enforced const correctness