Added strict checking of ./configure --with-syslog-* values
Added support for configuring syslog facility and log level from configuration file.
Also updated configuration file readability and commented out all settings - performance optimization.
If configuration file already exists, install new sample file with version suffix
Revert "If configuration file already exists, install new sample file with version suffix"

Come to think of it, config file will not be changing in the foreseeable future.

This reverts commit 167c278cfbc088f2dee7982f10a8cb335995f934.
Version bump to 2.1.0