Fix run vs build dependancies

 * Fixed up 'build package' so that it functions again (missing Makefile target)

 * The generated Makefile dependancies where previously only based on BDEPENDS.
   This changes results in 'build package' obeying BDEPENDS, while 'build
   install' obeys RDEPENDS.
Stop run/build dependancy resolution when we have an empty list
Enable support for "Release" versions

 * In bringing builder versions in-line with other vendor tools (ebuild, rpm,
   dpkg, etc) I am adding "optional" Release support.

 * In order to "hopefully" integrate with existing Builder tree's the RELEASE
   variable is allowed to be unset.  If unset builder will attempt to derrive a
   release from the VERSION variable.  If no RELEASE can be found, then the
   RELEASE defaults to 0.
Add support for package License information
Compress man pages during packaging
Feature: ability to export binary packages as RPM's

 * While LICENSE is usually an optional package variable, it is required when
   exporting packages to an RPM.

 * In the future it may be worth-while to support exporting to other package
   formats.