finance/taler-merchant: Update 1.5.9 => 1.6.16, improve port
finance/donau: [NEW PORT] Privacy-preserving distributed payment system (donau components)
- Use generic MASTER_SITES_GNU for pooled distribution over several mirrors and protocols (FTP, HTTP, HTTPS)
- Clarify multiple LICENSE and LICENSE_FILEs
- Use Meson build system
- Use SHEBANG_GLOB and wildcards for SHEBANG_FILES
- Pet portclippy(1) and portfmt(1)
- Add required support for GNU Taler donate authority components
- Add interactive GNU Info manuals
Remove the '--no-headers' flag from the Meson build target scripts.
This flag incorrectly stripped out the internal structure, node maps,
and hyperlinked menus required by the info(1) browser, rendering
the installed documentation files completely unreadable in the TUI.