The javascript and the index.html conflict when multiple hal are installed.

We need changes.

1) The template must be changed to load those files in a subdirectory unique to the hal package.

2) this specific directory is only installed when a debug package is created.

claneys change the source template

claneys update exisiting 4a-hal-reference package (fix packaging, remove hack)

tjahnke update the exisiting 4a-hal-unicens package following Romain template update