fixes #28

The tmprepo is a temporary repository used by abuild to handle the
dependencies of the newly built packages.

This will later be used to figure out the dynamic dependencies.

Run all subpackage functions and prepare the dirs first and create the
package itself later on. This will make it possible to automatically trace
the dependencies.

Also, speed up the detection of which makedeps are installed and which needs
to be built/installed. this requires apk-tools_pre11.

where <pkg> is package/subpackage name

fixes #23

sometimes it is possible to manually fix the problem, for example mount
the alpine device manually after modprobing the correct modules. Then it
makes sense to continue boot rather than just die.

set default packages dir to ~/packages

fixes #22

prefix a makedepends with ! and its treated as a conflict. for example:

makedepends="zlib-dev !gettext"

check if wget is in makedepends.

fixes #11

I think we only need raid1 and maybe raid5 but now we copy the entire md
subdir. so there are room for size optimization here.

use 'make iso' to build the iso image.

This is because we might want to build for usb