Custom libraries are not referenced in the kicad project

[sporniket]

When opening the schematics, all the custom symbols are replaced by big squares labelled with "??".

⇒ either keep the library folder where it is and add the custom symbol libraries into the project, taking care of expressing the pathes relative to the project directory

⇒ or move the library folder into the kicad project and then add these libraries into the project (in this case Kicad use relative pathes without being told to) ⇒ see PR #2

[dh219]

Will fold this into issue 3