Merge branch 'master' of git://github.com/espressomd/espresso
Merge branch 'master' of git://github.com/espressomd/espresso
Fix of error in virtual_sites_relative introduced with commit 94af...

Also includes more detailed test case. Th testcase now requires electrostatics and lennard_jones, because it verifies that interactions are correctly calculated between virtual sites.
Merge branch 'master' of https://github.com/espressomd/espresso
Fixed documentation of LinRegression command in the User Guide
Merge branch '3.0'
Removed reference to Espresso_bin from the mbtools section of the user guide
removed debug output
Merge branch 'master' into timecorr2
Merge branch 'master' of https://github.com/espressomd/espresso
Merge branch 'master' into lbgpu
added a check for forces==NAN after the force loop.

Lets see if this goes into main espresso
Merge branch 'forces_nancheck' into timecorr2
Corrected mathematical constants definitions for non-gcc compilers
Corrected mathematical constants definitions for non-gcc compilers
Updated NEWS.
added a first verion of velocity boundary conditions

and measuring forces on LB walls

Conflicts:

	src/lb.c
boundary forces seem to work now.

Conflicts:

	src/lb-boundaries.c
	src/lb-boundaries.h
	src/lb.c
	src/lb.h
corrected an error in previous merge
added the lbfluid get_interpolated_velocity