Prepare new version

prepare the new version

prepare the next 5.2.0 release

prepare the next released

fix issue spipu#200 pb with absolute path when saving the pdf file on…

… server

prepare v5.0.0 release

Merge pull request spipu#101 from juchi/update_version

update information for v4.6.1

update changelog file for 4.6 branch

Merge pull request spipu#86 from juchi/readme_files

update information files for 4.5.1 release

finalise v4.5.0