Fix ndless_installer

As stage1 relocates the GOT, -fPIE is required
Fix various flags in genzehn
Remove -fPIE in nspire-gcc
Fix some compiler warnings and remove nl_relocdata
Add nl_hwsubtype and remove nl_relocdata in header files
Fix various samples

-Somehow newlib-c++ works now
Get rid of useless malloc alignment, add some more features in zehn_loader

..like ndless version comparision and display of error messages