update license to L-GPL and add user_doc/Maze.md

user-doc/Maze.md

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+\page maze
+
+<!-- 
+description: Module that implements enhanced sampling methods for ligand 
+unbinding from protein tunnels.
+
+authors: Jakub Rydzewski
+
+reference: J. Rydzewski, and O. Valsson, Finding Multiple Reaction Pathways of 
+Ligand Unbinding, arXiv: 1808.08089, 2018
+-->
+
+maze is a module for PLUMED2, which implements enhanced sampling methods for 
+ligand unbinding from protein tunnels. The maze module is developed and 
+maintained by [Jakub Rydzewski](http://www.fizyka.umk.pl/~jr) at the Institute 
+of Physics, Nicolaus Copernicus University, Toruń, Poland. See this 
+[link](https://www.fizyka.umk.pl/~jr/maze.html) for additional information.
+
+The maze module is an optional module for PLUMED2 that needes to be enabled when 
+configuring the compilation of PLUMED2. You can either pass a flag
+'\-\-enable-modules=maze' or a '\-\-enable-modules=all' when running the 
+configure script. 
+
+See the following sections for further information:
+
+- \subpage maze_loss
+- \subpage maze_optimizer
+- \subpage maze_bias
+
+\page maze_loss Loss
+
+The following list contains the loss functions available in the maze module.
+
+@MAZE_LOSS@
+
+\page maze_optimizer Optimizers
+
+The following list contains the optimizers available in the maze module.
+
+@MAZE_OPTIMIZER@
+
+\page maze_bias Biases
+
+The following list contains the biases available in the maze module.
+
+@MAZE_BIAS@