As of reprap-mendel-20100806, the RepRap java host expects resend requests using the new "rs " format only, the version before this only excepted "Resend:"
Repsnapper as of SVN 348 accepts both formats.
Also fixed typo in config.h.dist
Traumflug: to avoid breaking compatibility with earlier host versions, I took the chance to additionally introduce a sort of rudimentary version compatibility system.