Fix broken links

Closes jlblancoc#106

README.md

@@ -8,7 +8,7 @@
 
 *nanoflann* is a **C++11 [header-only](http://en.wikipedia.org/wiki/Header-only) library** for building KD-Trees of datasets with different topologies: R<sup>2</sup>, R<sup>3</sup> (point clouds), SO(2) and SO(3) (2D and 3D rotation groups). No support for approximate NN is provided. *nanoflann* does not require compiling or installing. You just need to `#include <nanoflann.hpp>` in your code.
 
-This library is a *fork* of the [flann library](http://people.cs.ubc.ca/~mariusm/index.php/FLANN/FLANN) by Marius Muja and David G. Lowe, and born as a child project of [MRPT](https://www.mrpt.org/). Following the original license terms, *nanoflann* is distributed under the BSD license. Please, for bugs use the issues button or fork and open a pull request.
+This library is a *fork* of the [flann library](http://www.cs.ubc.ca/research/flann/) ([git](https://github.com/mariusmuja/flann)) by Marius Muja and David G. Lowe, and born as a child project of [MRPT](https://www.mrpt.org/). Following the original license terms, *nanoflann* is distributed under the BSD license. Please, for bugs use the issues button or fork and open a pull request.
 
 Cite as:
 ```
@@ -193,10 +193,10 @@ These performance tests are only representative of our testing. If you want to r
 
 ## 4. Other KD-tree projects
 
-  * [FLANN](http://people.cs.ubc.ca/~mariusm/index.php/FLANN/FLANN) - Marius Muja and David G. Lowe (University of British Columbia).
+  * [FLANN](http://www.cs.ubc.ca/research/flann/) - Marius Muja and David G. Lowe (University of British Columbia).
   * [FASTANN](http://www.robots.ox.ac.uk/~vgg/software/fastann/) - James Philbin (VGG, University of Oxford).
   * [ANN](http://www.cs.umd.edu/~mount/ANN/) - David M. Mount and Sunil Arya (University of Maryland).
-  * [libkdtree++](http://libkdtree.alioth.debian.org/) - Martin F. Krafft & others.
+  * [libkdtree++](https://packages.debian.org/source/sid/libkdtree++) - Martin F. Krafft & others.
 
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