cgi/h: fix a typo on the categories
master: add ordering in SQL
cgi/g: proper error handling with RRDs
cgi/g: use SI units
cgi/g: have the same look & feel as the 2.0 graphs
cgi/g: global headers is much cleaner
cgi/g: remove extra --imginfo

We don't use the rrdtool system command ay more
cgi/g: Reproduce the same look & feel of 2.0
Merge branch 'fix-cat-typo' into graph-sql

* fix-cat-typo:
  cgi/h: fix a typo on the categories