v0.3.410

Changes since last release:

• OpenCV 4.0.1 → 4.1
• Installation of OpenCV is not done anymore during package installation. It is done either when the library is called for the first time (the user is asked to confirm first) or when requested by the user with installOpenCV()
• installOpenCV() has a force argument that can be used by other packages that require OpenCV to be installed first in order to compile
• On Windows, OpenCV now compiles with Rtools 3.5 (was 3.4 before) and ROpenCVLite will attempt automatically to detect the location of Rtools (it had to be in C: before)