minor fix, NSVEp executable now compiles

bfps/DNS.py

@@ -74,6 +74,7 @@ class DNS(_code):
                 '"scope_timer.hpp"',
                 '"fftw_interface.hpp"',
                 '"full_code/main_code.hpp"',
+                '<cmath>',
                 '<iostream>',
                 '<hdf5.h>',
                 '<string>',

tests/test_DNS.py

@@ -2,7 +2,7 @@ from bfps.DNS import DNS
 
 
 def main():
-    c = DNS()
+    c = DNS(dns_type = 'NSVEp')
     c.write_src()
     c.compile_code()
     return None