Directories are added implicitly when entries are added, so there's no
need to add those directories. Directories without content don't need to
be added either, since due to the read-only nature of packages they will
remain empty.
* Build system: Create packages haiku-devel, haiku-welcome,
haiku-userguide, and makefile-engine.
* The TimGMSoundFont and BeBook zip files have been repackaged as hpkg
files.
* Adjust the optional package definitions accordingly.
The HaikuPackage rule now sets the variable
HAIKU_CURRENTLY_BUILT_HAIKU_PACKAGE to the given package and all
*ToPackage rules use that instead of a parameter. This saves passing the
package in each of those rule invocations.
* Create rules (build/jam/PackageRules) and a script,
build_haiku_package, to build hpkg files.
* Move all rule invocations that copy files and created symlinks and
directories in the "system" directory from HaikuImage to
HaikuPackages, which creates a package "haiku.hpkg".
* build_haiku_image: Comment out adding the copyrights info to
AboutSystem for the moment.
