* Change tabs to spaces.
* Make Boost required.

This allows you to install only specific components (i.e. binaries, resources, doc files in specific languages), particularly useful for package mainatiners.
Default install will work as before (i.e. install everything).

* fixed a bug in hierarchal shematics where a loop (e.g. same file included at different points in the 
hierarchy)  would cause infinite memory use.   
* added a edit footprint hotkey to eeschema, since it seems I'm always editing '0603' '0402' etc. on the 
common components, and it was difficult to edit this information before.

solved drc.cpp error (pcbnew crashes in track creation or edition). very minor other changes (translation)

--no commit message

- Fix minizip build.
- Fix eeschema/plugins build.
- Update TODO.

eschema, pcbnew and cvpcb did not find libraries when they were in the default library path, but in a subdirectory