Make scripts not simply rely on extension to determine file format,
check MAGIC number.
Fix bug when loading a .fib.

When nbBackward was 0, there is no redundant point so no need to
do 'nbForward - 1' when reading forward points.
Fixed writing of vtk file.

When writing the indices of the points composing a given line,
the indices were not the good one. It was always from 0 to 'len(fib)'.
Fixed writing of vtk file.

When writing the indices of the points composing a given line,
the indices were not the good one. It was always from 0 to 'len(fib)'.
Added a verification to add append EOF delimiter on writing mode.
Merge branch 'tck_fix'
Lower required version for distribute.
Added some utils functions + Refactored
Merged extension branch