make `make install` install stuff actually

So far, installing was done outside of the Makefiles, which means that the installing has to be duplicated per distro. This can be seen in the files in the debian folder and in https://github.com/archlinux/svntogit-community/blob/276cd50659b33f4b0ee2cc2b3d22b07665ff7a07/trunk/PKGBUILD#L48-L84. To avoid things like these while I was packaging this for Void Linux, I added or changed Makefiles for the individual projects. This way, I only need this patch in Void instead of workarounds like Arch has.

I'll assume that you'll want some changes to this, but I'd be really glad if we could get this (or a variant of it) upstream, to make packaging efforts on other distros easier.

There'll probably be some more patches to make cross compiling work in the future, but getting it this far has already been enough work, so I'll just use it like this until I have time to work on this again.