Merge branch 'permissions-fix' into 'master'

Permissions fix

During Debian packaging I noticed that executable permissions on several files are incorrect.  In the fist case files such as .gitignore, .png, .ico were wrongly set as executable.  In the second case, files that are meant to be running on the command line such as maintenance scripts starting with "#!/usr/bin/env php" do not have executable permissions.  These files were identified by lintian automatic checking program.  This merge request aims to fix the problem.

See merge request !21