Documentation: Some minor bootstrapping fixes
Documentation: Documented all current built-in rules
Documentation: Removed Split from the Jambase rules

It is now a built-in.
Documentation: Added vcxprojtojamfile to the scripts list
Built-ins: Fix crash in ExpandFileList when SEARCH_SOURCE is not defined
Jam: Fix crash introduced by the new LIST code in multipass builds
Tests: Fix runtests.lua to work with latest Lua filefind