Added missing headers
Merge pull request #4 from babrodtk/vs_2012_compilation_fix

Added missing headers (functional)
Fixed bug in subcurve due to reversed orientation.
Added more stable method for setting the span vectors.
Merge pull request #8 from SINTEF-Geometry/parallel_vec_fix

Parallel vec fix
Replaced epsgeo with epspar for parameter curve calculation, added debug function.
setSpanningVectorsSafe(): Choosing better values vec1_ and vec2_, i.e. with normal_ = z_axis, we set vec1_ =  x_axis and vec2_ = y_axis, etc.
Merge branch 'parallel_vec_fix'
No need to retesselate if the resolution is unchanged.
Fixed various bugs related to trimming of parametric surfaces.
Added date and build info to about() function in gvApplication.