samples/doall.sh: fix a problem with bash colours
noll_tree.h: add header file
noll_tree: add noll_tree_to_ta()
Makefile: add noll_tree
src/: change source code back to non-executable (please keep it like this)
noll_graph2ta: create a tree instead of a TA
noll_tree.h: improve documentation
put details on the changes done in ChangeLog.txt