import legacy files
restore some comments from old dtx
divert Lua<5.2 to legacy script in luaotfload-tool
load legacy code
hack db so as to include full paths
cleanup
add version switch to dtx
add legacy script to Makefile
Merge ../luaotfload-compat
update NEWS
locate legacy db script through kpse
use luatex for dtx extraction in Makefile
Merge pull request #64 from phi-gamma/master

brute force compatibility with older Luatex