version 3.19.0

PIMathVectorT subvector methods
PISystemTime::isNull()
PISystemTime::Frequency::isNull()
PISystemTime::toString()
PISystemTime::fromString()
PIVariant can handle strings with PISystemTime
PIDateTime::toSystemTime() now returns null time from invalid strings

CMakeLists.txt

@@ -2,8 +2,8 @@ cmake_minimum_required(VERSION 3.0)
 cmake_policy(SET CMP0017 NEW) # need include() with .cmake
 project(PIP)
 set(PIP_MAJOR    3)
-set(PIP_MINOR    18)
-set(PIP_REVISION 1)
+set(PIP_MINOR    19)
+set(PIP_REVISION 0)
 set(PIP_SUFFIX   )
 set(PIP_COMPANY  SHS)
 set(PIP_DOMAIN   org.SHS)