Version 1.5.2
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- more copyright updates in banner
- fixed MinGW cross-compilation (see 'BUILD.md')

Version 1.5.1
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- fixed copyright and added two regression traces

Version 1.5.0
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- added 'constrain' API call described in our FMCAD'21 paper

- replaced "`while () push_back ()`" with "`if () resize ()`" idiom
  (thanks go to Alexander Smal for pointing this out)
