Bug#908857: diffstat

[Guenther Brunthaler]

Adding statistics in order to provide an estimate about the extent of 
the of changes:

$ diffstat didiwiki_0.5-13_p1-2018.258.patch
 didi.c     |    7 +++++++
 http.c     |    6 ++++++
 wiki.c     |   16 ++++++++++++----
 wikitext.h |    8 +++++---
 4 files changed, 30 insertions(+), 7 deletions(-)