Tmpl: relax sort-tag chars; increment sequential sort-tags; New features: 1. Default change in `filename.sort_tag_chars`: sort-tags may now include lowercase letters. The space and tab characters are depreciated. 2. Tp-Note searches for the latest created document, extracts the sort-tag from the finding, increments it and uses the result as sort-tag for the new file. Incrementation examples: `02-3` -> `02-4` or `1b01f` -> `1b01g`. Chronological sort-tags like `20231024` are never incremented. 3. The viewer now understands so-called _format strings_ that can be appended to local links, e.g. the link `<tpnote:1a3?-->` expands to `<a href="1a3-my doc.md">my doc</a>` in case a file `1a3-my doc.md` exists in the current directory. Breaking changes: 1. In previous Tp-Note versions, the default set for allowed characters in sort-tags included the space and tab characters. From this version on, these characters are not allowed in valid sort-tags anymore. If needed, you can re-add them to the configuration file variable `filename.sort_tag_chars`.