found with cppcheck 2.1

cc: @gtribello

[multicolvar/InPlaneDistances.cpp:110] (warning) :nullPointerRedundantCheck: Either the condition 'bt' is redundant or there is possible null pointer dereference: bt.

This looks like it might be a real bug! Should be checked and potentially backported if it's a bug fix.

see  de1a304f

#582

#582

Fixes #582

Clarify that the energy CV is actually the potential energy

cc: @gtribello this is the reason why I would keep these instructions here

Spaces in `#include` statements where not matched correctly.

See 38eee95826f905ac20a388885523becdd9d883e5 and #570

See #549

Harmless bug, it was just showing an incorrect output in
./configure --help

@carlocamilloni

Make sure that output files are written out at the final step. Should fix issues with restarting reported by @PabloPiaggi