ENH: Updated DTIAtlasFiberAnalyzer from revision 131 to revision 137

Creating release 1.5
http://www.nitrc.org/plugins/scmsvn/viewcvs.php?view=rev&root=dti_tract_stat&revision=137
BUG: in fiberprocessing.cxx, 'ad' was refered as 'ad' instead of 'l1'
http://www.nitrc.org/plugins/scmsvn/viewcvs.php?view=rev&root=dti_tract_stat&revision=136
BUG: Do not try to install fiberprocess if it is not build
http://www.nitrc.org/plugins/scmsvn/viewcvs.php?view=rev&root=dti_tract_stat&revision=135
BUG: correct handling of data without ID column, detection of zipped vtk files (for no recompute)
http://www.nitrc.org/plugins/scmsvn/viewcvs.php?view=rev&root=dti_tract_stat&revision=134
STYLE: remove debug messages
http://www.nitrc.org/plugins/scmsvn/viewcvs.php?view=rev&root=dti_tract_stat&revision=133
BUG: Problem in variable name. It has one '_' too many install_dir was not always defined correctly
http://www.nitrc.org/plugins/scmsvn/viewcvs.php?view=rev&root=dti_tract_stat&revision=132