prerequisites.sh: remove subversion; up version

 - Remove subversion; it's no longer an ASSUME_PROVIDED.
 - Add python3-jinja2; it's needed by pkgdiffer.py .
 - Remove -H and -v aliases for -h and -V.

Open-webOS-DCO-1.0-Signed-off-by: Yegor Minin <yminin@luxoft.com>