added a 'show_item'-function to the molecule_list class
added build directories
Merge branch 'master' of github.com:janvc/molconv
Merge branch 'master' into open_dialog

Conflicts:
	source/molconv_window.cpp
changed table to list for molecules
Merge branch 'master' into open_dialog

Conflicts:
	source/molconv.cpp
	source/molconv_window.cpp