LOCAL: update paths for local configuration
scriptish-local-hack.sh

Unless `extensions.scriptish.cache.enabled` [1] is `true`, Scriptish loads scripts from disk each time they are required. Linking the scripts in Scriptish profile directory into git tree allows easier development, it is not necessary to reinstall Wiki Monkey after each change.

[1]: https://github.com/scriptish/scriptish/wiki/Manual%3A-Preferences#wiki-boolean-extensionsscriptishcacheenabled--new-in-scriptish
scriptish-local-hack: use programmatic approach
scriptish-local-hack: safe_ln() is useless, it is already ensured that target exists
ArchWikiNPFilter.js: language-based filter for Special:NewPages
sample configuration for NPFilter (does not work, the @require metadata will have to be changed)
simplify fallback condition
add support for Special:AllPages and Special:PrefixIndex (bug #155)