3ds export addon: fixed comments to not interfere with string-literals, reported by IRIE Shinsuke via mailing list

- add button in toolbar
- fracture all meshes in selection
- add option for layer to add into

- temp workaround for convex hull failing

add support for using non mesh objects as point sources (mainly for curves but meta's and surfaces also work)
remove face/edge point sources. not really that useful in most cases and clogged up UI.

- added options to fracture into a new group and to use the next layer then the active object.
- noise option wasnt working right, was always adding a lot of noise.

options
- recursive fracture
- source limit
- source point noise

still work in progress

MHX importer: Removed some dead code, and now display two digits for minor version number to avoid confusion.

patch from Chris Want to make ply script more useful when imported from other scripts (returning a mesh).

*Mostly, makes much more intensive use of Blender's FileSelector, to only show relevant files, and allow any pict/video files when "all" is selected (previously e.g. importing mkv's was impossible!).
*Style cleaning/refactoring (esp. do not use 'self' for anythin else than a method's object, so made most func member of op class)...

finished