doc: updated download links to v9; this really fixes #160

updated pdfsizeopt.single

doc: updated download links; this fixes #160

updated pdfsizeopt.single

updated Linux binaries links to pdfsizeopt_libexec_linux-v4.tar.gz; u…

…pdated installation instruction with Docker

doc: fixed Ghostscript version

fixed /Encoding in the output of ConvertType1FontsToType1C; this fixes …

…#50

added using of pdfslizeopt_libexec/python if available, to pdfsizeopt…

… and pdfsizeopt.single shell scripts

updated pdfsizeopt.single

updated pdfsizeopt.single