Fix for GitHub issue #206 in upstream

Passing -L should only print files which do not match the pattern
Removed commas from options output

The rest of the options don’t have commas.  Consistency is nice. :)
Align long-options in help for better readability
Grouped Output and Search options separately
Tweaked option groups
Adding CentOS build instructions. EOM
Added OpenBSD instructions to readme.
Merge pull request #266 from n0la/openbsd-install-instructions

Added OpenBSD instructions to readme.
Merge pull request #264 from timvisher/add-centos-build-instructions

Add CentOS build instructions
Excluded invalid initial bytes of 2 byte code.
Fixed initial bytes of 3 byte code.
Fixed non-initial bytes of multibyte code.
Merge pull request #211 from mcphail/issue_206

Fix for GitHub issue #206 in upstream
Merge pull request #267 from monochromegane/detect-utf8-files-correctly

Detect utf8 files correctly
Trailing whitespace.
Tag new release.
And bump version to 0.17pre.
That comma is wrong, and the configure won't find pthread.h because of this.
Merge pull request #272 from n0la/bugfix/comma-in-configure.ac

Wrong comma in configure.ac.
Cleanup unused variable.