regtest

addresses #228

regtest/basic/rt-fix-228/COLVAR.0.reference

+#! FIELDS time d
+ 0.000000 1.732051

regtest/basic/rt-fix-228/COLVAR.1.reference

+#! FIELDS time d
+ 0.000000 6.928203

regtest/basic/rt-fix-228/Makefile

+include ../../scripts/test.make

regtest/basic/rt-fix-228/config

+mpiprocs=2
+type=driver
+# this is to test a different name
+arg="--plumed plumed.dat --ixyz traj.xyz --multi 2"

regtest/basic/rt-fix-228/plumed.0.dat

+d: DISTANCE ATOMS=1,2
+PRINT ARG=d FILE=COLVAR

regtest/basic/rt-fix-228/plumed.1.dat

+d: DISTANCE ATOMS=1,3
+PRINT ARG=d FILE=COLVAR

regtest/basic/rt-fix-228/traj.xyz

+3
+0 0 0
+Ar 1 2 3
+Ar 2 3 4
+Ar 5 6 7