Fix (tested on gnu/linux): non-ascii file names could not be opened via the command line

Signed-off-by: Mattias Andrée <maandree@operamail.com>
sync
Fixes problem where local changes are overwritten on automatic reload when included files has changed. Fixes #162
Merge branch 'master' of github.com:maandree/openscad into maandree-master
Handle files with non-ascii filenames. Only rudimentary tested. Fixes #113 #290
sync
Merge branch 'master' of github.com:openscad/openscad into resize5