First test version of an lfe command
Fix new lfe command which can handle arguments properly

There are in fact two versions, lfe which uses the c-program lfeexec,
and lfe-1 which is completely written in sh. Irrespective of which one
we choose lfescript will be rewritten to use the same technique.
Fix lfescript command to handle arguments properly

It now also works out where it is and adds ebin relative to that.
Make lfescript handle arguments the same as lfe

Both lfe and lfescript do all argument processing in sh. A bit nifty
but not difficult, and it can handle funny characters like spaces in
all the arguments.