Importing libconfig. Our inclusion is in compliance with the LGPL.

--HG--
branch : week-of-code

src/enzo/libconfig/AUTHORS

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+
+Mark Lindner - Lead developer & maintainer.
+Daniel Marjamäki - Enhancements & bugfixes.
+Andrew Tytula - Windows port.
+Glenn Herteg - Enhancements, bugfixes, documentation corrections.

src/enzo/libconfig/README

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+
+To produce a PDF manual, issue the command "make pdf" after running
+`./configure'.
+
+				 -*-
+
+If you do not wish to build the C++ components, use:
+
+./configure --disable-cxx
+
+				 -*-
+
+The `examples' subdirectory contains some examples of using libconfig
+from C and C++.
+
+				 -*-
+
+The config file syntax changed between versions 0.8 and 0.9. In order
+to implement all of the feature/enhancement requests in an elegant and
+self-consistent way, the configuration grammar had to be changed in a
+non-backward-compatible way. In particular, groups are now values, so
+the old syntax:
+
+group
+{
+  ...
+}
+
+must now be written as:
+
+group =
+{
+  ...
+};
+
+Note that the trailing semicolon, which was previously optional, is
+now required. Also note that a colon (':') can be used in place of the
+equals sign.
+
+				 -*-
+
+Flex and Bison are not required in order to build this
+package. However, if you modify the .l or .y files, you must have Flex
+(2.5.31 or better) and Bison (2.1 or better), respectively.
+
+				 -*-
+
+To successfully compile using MinGW (with gcc 4.4.0 or later), it may
+be necessary to modify the file "mingw32\4.4.0\libstdc++.la", changing line 11
+from:
+
+library_names='libstdc++.dll.a'
+
+to:
+
+library_names='libstdc++.a'
+
+(See http://trac.osgeo.org/geos/ticket/282 for more information).

src/enzo/libconfig/README.enzo

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+This is the package libconfig-1.4.6, included here for convenience.  This
+library's homepage is available at http://www.hyperrealm.com/libconfig/ .
+
+libconfig is released under the LGPL, detailed in COPYING.LIB.  For more
+information about libconfig, see the README, COPYING.LIB and AUTHORS files.
+For details of license compliance, please see COPYING.LIB and consult the
+website of the Free Software Foundation.
+
+We have modified the source tree in a very minor way.  We have applied this
+patch to scanner.l (modified version included):
+
+89,90c89,90
+< integer           [-+]?[0-9]+
+< integer64         [-+]?[0-9]+L(L)?
+---
+> 
+> integer64         [-+]?[0-9]+(L(L)?)?
+165d164
+< {integer}         { yylval->ival = atoi(yytext); return(TOK_INTEGER); }
+
+This removed the integer as a potential parse-target, and forces everything to
+64-bit integers.  As such we have not provided a purely-libconfig experience.
+After this patch was applied, scanner.c was re-generated using lex.