Let manual be installed in docsdir
jam will also create ehelp from ehelp.in setting correct location
Fixed a typo with RMDIR_UNSAFE so Cleandir can work now
Added CopyDir rule
Added missing linking libraries for capone
Added scheme_error() for error reporting from C code
load-extension exists now, althought it does not do what I want
Added timeit-start, timeit-end and timeit-result functions for easier timing
Some map, and my map timing for comparison
