Fix for single pixel .sdt files & (unrelated) problem with dividing by Count Increment where (java) sign bit is set.
Merge pull request #1163 from melissalinkert/rebased/develop/SDT_meas_mode_0

Fix for BH .Sdt meas mode 0 & 1 single pixel files & (unrelated) problem with dividing by increment count. (rebased onto develop)