Merge pull request #2 from ivuk/master

Fix the .sample file install in doc folder when building an RPM
Fix bug with new year change when LAST_PARSED has a last line parsed from December. Thanks to Richard Victor Correia for the report.
Change copyright year.
Update Changelog and version to 8.7
Add man page for sa_cache. Thanks to Lars Vogdt for the patch.
Improve speed of incremental_chech() function.
Second attempt to fix case with log from previous year. Now sendmailanalyzer will automatically use past year when date in the log is in the future. You can force the year to use with a new command line option -y or --year. Thanks to Damian Lukowski for the report.
Reorder command line options in usage() display.
Update ChangeLog
Renamed PID_FILE directive into PID_DIR to be less confusing and fix default path, backward compatibility with old configuration file is preserved. Thanks to Thomas Merlin for the report.
Fix case where virus with Amavis and clamd are reported twice. Thanks to Paul Cantle for the report.
Fix documentation about Postfix that is no fully supported. Thanks to Comprax for the report.
Fix case where amavis spam details was not collected. Thanks to grufo for the report.
remove temporary debug information.
SA will now show top recipients in topvirus view even if they was not sent.
Fix case where recipients were not stored with amavis spam and virus detection.
Remove some postfix/postscreen information from reject report. Thanks to daks-ua for the report.
Force vertical alignement on top of columns on Top Statistics.
Clear extra information from DNSBL spam detail report.
Remove some posfix debug or info messages from rejection reports.