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and install scripts should not be in $source

This is needed when bootstrapping the system.

otherwise will awk not detect empty fields

abuild will not consider package up2date unless apk cache is up2date

Basicly, let apk-tools deal with the dependencies rather than let abuild do it

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 #22