[IMP] Added quantity as type and variable_factor + sequence for flexibility to delivery grid line
[IMP] remove setting of color.ui

After further considering PR #21's arguments, the setup script should
not go around setting `color.ui`:

* it shouldn't be needed for recent gits with default compile
  settings[0]
* it may override advanced users's own colour configuration/
  customisations (or disabling)
* it forces default colours on users for which it may be useless
  (colour- blind) or even detrimental (other vision impairments)
* some linux distributions apparently default to idiotic pagers which
  can't handle ANSI colour codes by default and spew garbage to the
  terminal

[0] https://github.com/git/git/blob/master/Documentation/RelNotes/1.8.4.txt#L178-L180
Add quantity in variable factor too...

I forgot to add the changes before committing
Add < and > operators to allow rules without gap (eg: until 100 & above 100)
Add sequence field with handle in tree view
Improvement of the delivery module

Add field sequence on the delivery.gird.line to order rules
Add condition quantity to add more flexibility in the rules
Add operators > and < to be able to create rules without gap (instead of needing hack like 'x <= 100', 'x >= 100.000001')