This is a patch to add bedtools to the bioinformatics module.  It
depends on samtools and is part of the bioinformatics module created
with the samtools patch.

Since there is no install phase in the Makefile I had to write a
replacement to copy all tools from the build bin/ directory to the
output /bin/ directory.  I don't know if it is better to explicitly list
the tools to copy or if this should rather be done with a glob pattern.

Another source of ugliness in the recipe is the
patch-makefile-SHELL-definition phase which is really just
patch-makefile-SHELL but working on ":=" definitions rather than
"=" assignments.  Augmenting patch-makefile-SHELL to handle definitions
as well would result in a cleaner package recipe.

Cheers,
rekado