GitLab

- updated the Readme file

Reworked the Ethane example to use the same structure as the NaCl one, and made a few minor changes to NaCl too.

(1) Changed HelloArgon to avoid use of now-obsolete context.getTime() to avoid future problems with variable step integration.
(2) Added HelloArgonInC.

In calcForces() kReduceBornSumAndForces kernel is not needed since Born radii/Obc chain term now calculated prior to calculation of forces
Modified kCalculateObcGbsaBornSum kernel loop to match that in kCalculateCDLJObcGbsaForces1; Born sums are zero w/o mods