Tiny update to fix latte for checking library version

Added warning to discourage use of group all and fixed some segfault …

added old tangent to fix_neb for AGNI potential

per-atom property dynamic group

2nd try on LATTE error returns, plus a couple minor doc edits

Clarify the comment as to why this else branch was added and what this represents.

Lennard-Jones with Coulomb interactions accounted through Wolf sum

Collected small changes for next patch release

When compiling with g++ (GCC) 4.4.7 20120313 (Red Hat 4.4.7-18) an error occurs: 
error.cpp: In member function ‘void Error::generate_error(unsigned int, std::string, std::string)’:
error.cpp:146: error: ‘exit’ was not declared in this scope
The fix is to include the #include <cstdlib> where the exit() function is decleared in the error.cpp file