2005/11/03 - 1.1
   * The generation of the solution file (.sol) has been REMOVED. This 
     file is created by Optimizer to save the optimal solution of     
     an LP/QP/MILP/MIQP problem. Removing this file has reduced the 
     overhead of time required by Optimizer to find a solution.

2005/10/27 - 1.0
	* Completely re-written the MEXPRESS. Here are a list of 
	  new features:
	   - a new optimized C++ code;
	   - added 'xpress' a new function to input in a simpler way 
	     optimization problems;
	   - maintained 'mexpress' for compatibility.
	   - Removed several files and written only one files, 
	     'xpresscc.cpp'.

2004/11/05 - 0.4.2
   * Added a new feature in MEXPRESS. For each optimization the license is
     taken and released. If you have to solve a sequence of optimization 
     problems this solution introduces a big delay. Now, a field "niter"
     in the 'param' structure has been introduced in order to keep the 
     license for niter optimizations, namely the license is taken at the 
     first optimization and released at the last optimization. For instance, 
     if niter=1e6 the license is released after 1e6 optimizations. To 
     release the license before this limit you can "clear all" or exit from 
     Matlab. An example of this feature has been added in the package with 
     the file xpmultipleopt.m.
     
   * Added the xpmultipleopt.m file.
   
   * Changed name of makepress in makexpress.m.

2004/07/10 - 0.4.1
   * If a quadratic cost function H of all zeros is passed the mex interface
     switch to a LP/MILP problem.

2004/05/28 - 0.4
   * Lower and upper bounds of binary variables are set to 0 and 1 respectively 
     by default. This avoids the problem that Optimizer library consider binary
     variables as integer of the lower and upper bounds are different from 0 and 
     1.

   * If an MILP is infeasible or unbounded at the root node the exit 
     the value of LP solution status is returned LPSTATUS.

   * Corrected a bug in the sparse matrix A (thanks to J. Lofberg)
   
   * Added as output data informations on dual, slack variables and reduced costs.
     The LAMBDA field has been replaced with the EXTRA fields containing the following
     fields: lambda, rc, slack.

   * The solution file is generated only for MIQP prolems due to a bug in
     the Barrier Optimizer who will be fixed (hopefully) in the next release
     of Xpress.

2004/05/01 - 0.3
   * Corrected dimension checks on the linear cost function.
   
   * Inverted the order of the output parameters. 
     Now, the order is [xopt, obj, status] instead of [status, obj, xopt]

2004/01/08 - 0.2
   * Added the MEXPRESSPARAMS file.
   
   * Added the 'params' field to set some control parameters.
   
2004/01/07 - 0.1
   * First release.