Update to 0.19

Upstream changes:
0.19      2016-08-18 18:52:33Z
    - fix checking of SvUTF8 flag

0.18      2016-08-16 01:07:54Z
    - no changes since 0.17

0.17      2016-06-27 22:45:27Z (TRIAL RELEASE)
    - fixed parsing error where the name contains a single colon but the last
      separator is :: (Leon Timmermans)

0.16      2016-06-21 03:41:40Z (TRIAL RELEASE)
    - support binary and unicode symbol names (Leon Timmermans, Aristotle
      Pagaltzis, Peter Rabbitson, Reini Urban, PR#8)

(wen)