Commit of all development done during the last three weeks.

Build scripts:
  - Added build scripts for many packages and removed unneeded ones.
  - Package updates:
    - Dropbear 2012.55 -> 2013.57
    - dvtm 0.8 -> 0.9
    - Linux 3.2.42 -> 3.2.43
  - Added fallbacks for build script functions.
  - Added build script categories.

Bug fixes:
  - Improved the xorg_base package template, to create a
    distribution-independent rgb.txt path.
  - Fixed a bug which prevented packages without source files from being built.
  - Added PAGER, to make man and git status work.
  - /usr/bin/cdrkit is missing in Debian, a symlink to genisoimage is created
    using a package template.
  - dhcpcd is named "dhcpcd5" in Debian, a symlink named "dhcpcd" is created
    using a package template.
  - When D-Bus is terminated, the pidfile is deleted (otherwise, it won't start
    again).

Other changes:
  - Added a locale-gen implementation.
  - Unified hpm-install and hpm-remove into hpm and implemented recursive
    fetching and installation of dependencies in hpm-get.
  - Moved all packages-specific files from the root file system skeleton to
    package templates.
  - Moved package-specific code from the root file system skeleton to templates.
  - More changes I don't remember :)
Added empty directories dropped from the previous commit.