Initial Windows implementation of built-in library path. Part of #125
Added meny entry for disclosing the library path. Part of #125
Starting point for Unix implementation of built-in library path. Part of #125
compile fix
code comments
merge branch to get windows "library path" working. tweak build system,
eliminate several compiler warnings.
windows - library path find, also windows build fixes
add 'create library' call to mainwin.cc GUI.
fix bugs in win version
fix buggy string init. remove debug string
Merge branch 'master' of github.com:openscad/openscad into issue125
Merge pull request #368 from openscad/issue125

Issue125