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8b0d7e6799
At branch 'doc-from-discord-boost-discussion-20170926'. The build documentation and scripts were slightly out of date about Boost. This commit makes a (probably interim) update to them. (CMakeLists.txt|SConstruct): `wesnoth` won't build using Boost earlier than '1.50.0'. Boost 1.50.0 changed the location of version 3 of Boost filesystem, from 'boost/filesystem/v3/' (e.g. for 'using boost::filesystem::v3::path;') to 'boost/filesystem/' (e.g. for 'using boost::filesystem::path;', enforced since the very introduction of 'src/filesystem_boost.cpp'), making it incompatible unless using precompiler directives for supporting backwards versions of Boost filesystem prior than '1.50.0'. Using Boost 1.50.0 (and 51, 52 etc.) `wesnoth` is able build and run. I checked using `ldd` that I am right about the run time environment. INSTALL.md: Requirement of Boost libraries version up to date. projectfiles/VC12/README.md: Requirement of Boost libraries up to date, only the statement of which one is the minimum version, not the rest of the build guide for Boost as requirement. .gitignore: Add KDevelop backup documents.