Fixed a bug in observables when particle numbers are not contiguous.
Merge branch 'master' of https://github.com/kessel/espresso
Added new MPI functions.
Some more fixes to Stefan's megamerge.
Updated UG to reflect the status of the EK project.
Merge pull request #154 from jdegraaf/Merged_EK_newest

Updated UG to reflect the status of the EK project.
Some fiex to electrokinetics docs.
fixed gpu implementation of [lbboundary delete]
Added conditional compilation of mass.
Merge pull request #156 from kessel/master

Master
Fixes for distcheck.
Fixed correlation example, fixes to error messages
Merge pull request #157 from kosovan/master

Fixed correlation example, fixes to error messages
Merge branch 'master' of git://github.com/espressomd/espresso

Conflicts:
	src/tcl/statistics_observable_tcl.cpp
Removed last traces of ignore_charges
Now also checking O3 if O5 is not possible (e.g. llvm)
particle print no longer checks for runtime errors, which cannot occur anyways
Removed the dysfunctional invalidate_system, updated checkpointing documentation.
Removed invalidate_system voodoo from tests
Updated NEWS.