Revert "Remove $NTA"

This reverts commit 467391414788a7255f85bdbfae913f3b0df2fd04. (reverted from commit ccaae626941c3b2a89bcda5e790f5a90c1d9a499)
Merge pull request #144 from DavidRagazzi/remove-nta

Revert "Remove $NTA"
Revert flags moved to GNU section
Included a section for CLANG
Merge pull request #153 from DavidRagazzi/patch-1

Revert flags moved to GNU section
Solaris support (sans externals)
Merge remote-tracking branch 'origin/master' into SunOS-support

Conflicts:
	src/CMakeLists.txt
Add README.md for instructions on building on solaris
Fix typos in readme
Merge pull request #158 from oxtopus/SunOS-support

64-bit SunOS support