Dump STF at time 0

 - STF dump previously started after first timestep, which led to first sample (at t=0) missing.
 - Also removes the zero-valued sample at the end of the STF
Number of dumps was estimated one too large

 * Usage of floor()+1 makes more sense than ceiling()+1
 * This fixes the issue with the kernel wavefields being shifted in time weirdly. The bug was introduced in commit 4fdc3be0b9163702cd293f978f30a53c8313fa17
fixing init of eltype_vtk array
adding fletcher32 checksum, might be useful for the very large files at high frequencies
write the ordered_output.nc4 directly into the Data dir

makes a difference, if Data is not just a subdirectory but located somewhere else
adding min and max radius/colat to netcdf file
adding time_scheme to netcdf file
make the threading a bit more robust: if c_wait... is called before the thread is spawned,

on some machines resulted in a segfault. Now this should be safe
Write out all model parameters into NetCDF file

 - Now includes: phi, xi, eta and Qmu and Qkappa
 - Fix in nc_dump_elastic_parameters, where solid elements were written
   into fluid part.
adding planetary radius to netcdf file
Merge branch 'master' of https://github.com/geodynamics/axisem