fixing warning [-Wdelete-non-virtual-dtor]
iterator/circulator support + other improvements in FP
fixing build and basic test issues
cleaning IteratorTraits.h
 advance + middle functions
range size function
cleaning/improving circulator class + its unit tests
extra tests with circulators (range size and middle)
test of IteratorCirculatorTraits class
small corrections: difference type + inline
small corrections: cleaning isNotEmpty function
doc for iterators and ranges
more doc
first version of doc finished
some edits
adding includes in test files
Merge branch 'master' of http://github.com/DGtal-team/DGtal
merging with master
Unnecessary typenames removed
Better performances for progressBAr