v0.5.1

• extends $info with arch_file_path and arch_folder_path, and makes arch_file_name represent the basename of a file path
• allows parameters that have the same name as keywords, e.g. from
• improves handling of invalid control statements, .e.g files containing only a single dot (.)
• improves first/last operator when used in nested set iterations
• adds a new (cross-platform) bundle command that bundles pyrsl into a pyz file (gen_erate.pyz)