Logging

[Roman2K]

Currently, there's next to no logging:

• errors are the main way to report information back to the user when finally written to stderr in main
• some messages may be printed to stderr when there's no caller to return an error to (ex: cascade in multireader, error correction in parity, write errors in ansirefresh)

Add a proper logger for:

• those errors
• tracing of normal activity
  • begin/end of chunk processing
    • size before, after
    • elapsed time
  • passing from one proc to the next
  • within procs
    • reads, writes, downloads, uploads
    • error detection and correction
  • etc.