v2.19.7

• Avoid braceless multiple statements MS_SWAPBTIME macro usage.
• Fix statement macros by @QuLogic. #73
• Simplification of byte swapping routines by @QuLogic. #74
• Avoid string buffer overflow warnings.
• Makefile mods for CMake as ExternalProject by Sriram Sundararajan.
• Encapsulate value of MS_NSTIME2EPOCH and MS_EPOCH2NSTIME macros.
• Fix example mst_pack().