I've added a post_install step to the system that allows you to run
arbitrary commands after the regular install step.
This allows scripts that start with "#!/bin/bash" to work in Serenity.
* Use ${version} instead of explicit version numbers in urls/filenames
* Move -L option to port script, as this is always good
* Fix some various other stuff
Ports/.port_include.sh, Toolchain/BuildIt.sh, Toolchain/UseIt.sh
have been left largely untouched due to use of Bash-exclusive
functions and variables such as $BASH_SOURCE, pushd and popd.
Much redundancy is removed from package scripts with this system.
It also supports simple dependency management, uninstalling (through
BSD ports style plist files), cleaning up after itself (with clean,
clean_dist, clean_all commands), etc.
This way, we don't (in the ports themselves) depend on perl as a public
interface, which means if we ever have to, we can port to something else easier.
