Removed old license, added new unlicense (#594)

This is free and unencumbered software released into the public domain.

Anyone is free to copy, modify, publish, use, compile, sell, or

distribute this software, either in source code form or as a compiled

binary, for any purpose, commercial or non-commercial, and by any

means.

In jurisdictions that recognize copyright laws, the author or authors

of this software dedicate any and all copyright interest in the

software to the public domain. We make this dedication for the benefit

of the public at large and to the detriment of our heirs and

successors. We intend this dedication to be an overt act of

relinquishment in perpetuity of all present and future rights to this

software under copyright law.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.

IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR

OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,

ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR

OTHER DEALINGS IN THE SOFTWARE.

For more information, please refer to <http://unlicense.org/>

ISIS Licensing, copyright, distribution, and warranty information

USGS-authored or produced data, information, and software are in the 

public domain. 

Software and related material (data and (or) documentation), contained in or 

furnished in connection with a software distribution, are made available by 

the U.S. Geological Survey (USGS) to be used in the public interest and in 

the advancement of science. You may, without any fee or cost, use, copy, 

modify, or distribute this software, and any derivative works thereof, and 

its supporting documentation, subject to the following restrictions and 

understandings. 

If you distribute copies or modifications of the software and related 

material, make sure the recipients receive a copy of this notice and 

receive or can get a copy of the original distribution. If the software and 

(or) related material are modified and distributed, it must be made clear 

that the recipients do not have the original and they must be informed of 

the extent of the modifications. For example, modified files must include a 

prominent notice stating the modifications made, the author of the 

modifications, and the date the modifications were made. This restriction is 

necessary to guard against problems introduced in the software by others, 

reflecting negatively on the reputation of the USGS. 

The software is public property and you therefore have the right to the 

source code, if desired. You may charge fees for distribution, warranties, 

and services provided in connection with the software or derivative works 

thereof. The name USGS can be used in any advertising or publicity to 

endorse or promote any products or commercial entity using this software 

if specific written permission is obtained from the USGS. 

The user agrees to appropriately acknowledge the authors and the USGS in 

publications that result from the use of this software or in products that 

include this software in whole or in part. 

Because the software and related material are free (other than nominal 

materials and handling fees) and provided "as is," the authors, the USGS, 

and the United States Government have made no warranty, express or implied, 

as to accuracy or completeness and are not obligated to provide the user 

with any support, consulting, training or assistance of any kind with 

regard to the use, operation, and performance of this software nor to 

provide the user with any updates, revisions, new versions or "bug fixes." 

The user assumes all risk for any damages whatsoever resulting from 

loss of use, data, or profits arising in connection with the access, 

use, quality, or performance of this software