DOM access code refactorised.
DOM access code refactorised.

to sum up:
what was:
    domRoot.find('#slot'+slot.id+' .compilers').append(elem);
is now:
    slot.node.find('.compilers').append(elem);

mattgodbolt/gcc-explorer,mattgodbolt/compiler-explorer,dkm/gcc-explorer,dkm/gcc-explorer,mattgodbolt/compiler-explorer,dkm/gcc-explorer,dkm/gcc-explorer,mattgodbolt/gcc-explorer,mattgodbolt/compiler-explorer,mattgodbolt/compiler-explorer,ibuclaw/gcc-explorer,dkm/gcc-explorer,ibuclaw/gcc-explorer,dkm/gcc-explorer,mattgodbolt/gcc-explorer,mattgodbolt/compiler-explorer,mattgodbolt/compiler-explorer,mattgodbolt/compiler-explorer,ibuclaw/gcc-explorer,mattgodbolt/gcc-explorer,dkm/gcc-explorer,mattgodbolt/gcc-explorer,dkm/gcc-explorer,ibuclaw/gcc-explorer,dkm/gcc-explorer,mattgodbolt/compiler-explorer,ibuclaw/gcc-explorer