Moved filopodia geometry meta-data (fPoints, segFromPoints etc.) into the mesh_t structure,

so now every filopodium remembers it. This is useful for generating filo texture later.
Mesh moving and scaling functions were updated to reflect this.

Updated ImportVTK_Ftree() and InitDots_filo() so that the former really only
reads the filo geometry and the latter creates a texture for it.

Filopodia skeleton segments are displayed in OpenGL now by default.