Zlib license

The Praat source code contains a copy of the Zlib library for compression and decompression of files (see Acknowledgments). Here is the Zlib license text:

`This software is provided 'as-is', without any express or implied
` `warranty. In no event will the authors be held liable for any damages
` `arising from the use of this software.
` `
` `Permission is granted to anyone to use this software for any purpose,
` `including commercial applications, and to alter it and redistribute it
` `freely, subject to the following restrictions:
` `
` `1. The origin of this software must not be misrepresented; you must not
` `claim that you wrote the original software. If you use this software
` `in a product, an acknowledgment in the product documentation would be
` `appreciated but is not required.
` `2. Altered source versions must be plainly marked as such, and must not be
` `misrepresented as being the original software.
` `3. This notice may not be removed or altered from any source distribution.
` `
` `Jean-loup Gailly Mark Adler
` `jloup@gzip.org madler@alumni.caltech.edu
`