Thanksgiving 2018 PR Catchup

• Fix digitemp.spec Version in bumpver target (bcl)
• Make sure strncpy uses are null-terminated (bcl)
• Add a check for ROM number vs. SENSORS count (bcl)
• Log the scratchpad diagnostics (bcl)
• Bump Copyright Year to 2018 (bcl)
• Fix strftime use of log_file (bcl)
• Add strftime formating to logfile name (peje)
• Clean up the start_time switch statement usage (bcl)
• Add log_type 4 & 5 (peje)
• Check for bad Get_Temperature result (bcl)
• Fix the return value of Get_Temperature in ad26.c (bcl)
• Display DS2438 temperature even if humidity calculation fails. (bcl)
• Always include types.h and time.h (bcl)
• Bump copyright year to 2016 (bcl)
• Add bumpver target (bcl)
• Spelling corrections (ryan)